Do MLB Umpires Review Their Calls? The Complete Guide to Umpire Review Systems

Do MLB umpires review their calls? The short answer is yes — but the process is far more structured, limited, and nuanced than most fans and aspiring officials realize. Since Major League Baseball introduced the Expanded Instant Replay system in 2014, umpires have operated within a formal framework that allows certain calls to be overturned after video review. Understanding how that system works is essential knowledge for anyone pursuing umpire certification, studying for an officiating exam, or simply trying to understand the modern game at a deeper level.

The review process in professional baseball is managed collaboratively. When a manager challenges a call, or when the crew chief initiates an umpire review independently, the play is sent to the Replay Operations Center in New York. A team of officials there watches multiple camera angles and communicates via headset with the crew chief on the field. The crew chief then relays the final ruling — confirmed, overturned, or stands — to both managers and the stadium announcer. The entire process typically takes two to four minutes, though complex plays can take longer.

It is worth noting that not every call is reviewable. Fair or foul balls, home run calls, plays at bases involving tag or force plays, hit batters, and fan interference are all subject to replay. However, ball and strike calls, the infield fly rule, and check swing rulings are explicitly excluded from the review process. This distinction is critical for umpires at every level to understand, because amateur and collegiate leagues often model their own review policies on the MLB framework, adjusting scope based on available technology and resources.

For aspiring umpires, the existence of a formal review system changes the landscape of the profession in meaningful ways. It means that getting a call right the first time matters more than ever — replay brings unprecedented scrutiny to decisions that once relied entirely on positioning, angle, and instinct. Understanding umpire review mechanics and proper signal communication is now inseparable from mastering positioning and mechanics on the field.

The crew chief plays a central role in the review ecosystem. In a four-umpire crew, the crew chief is the final authority on whether to initiate a crew chief review and on relaying the outcome from New York. In two- or three-umpire systems used at lower levels, the senior umpire often fills this coordination role. Learning how crew dynamics function during a review — who speaks, who moves, where each umpire positions themselves — is a tested topic on many umpire certification exams across the country.

Beyond the mechanics of replay, the philosophy behind review matters deeply. MLB structured the system to correct clear and convincing errors, not to second-guess judgment calls or introduce uncertainty into the flow of the game. Umpires are expected to make definitive, confident calls in real time and rely on the review system only as a safety net for the most consequential and verifiable errors. That ethos — decisive confidence backed by solid mechanics and rules knowledge — is precisely what certification programs across the country are designed to build in new officials.

This article breaks down every dimension of the umpire review system: how MLB replay works step by step, which calls are reviewable, how crew chiefs manage the process, what the data says about accuracy and overturn rates, and how studying the review framework can help you perform better on your umpire certification exam. Whether you are a fan wanting to understand what you are watching or a future official preparing for a career on the diamond, this is your complete guide.

Understanding exactly which calls are subject to replay review — and which are permanently off-limits — is one of the most practical pieces of knowledge an umpire can carry onto the field. MLB's reviewable play categories are defined in Official Baseball Rule 8.02 and the related replay regulations.

They include: tag plays and force plays at any base, including home plate; fair or foul balls only when the ball lands beyond first or third base; home run determinations, including whether a ball cleared the fence, was touched by a fan, or bounced back into play; hit-by-pitch rulings; passing a preceding runner; batting out of order; and specific types of spectator interference.

Equally important — and more commonly tested on certification exams — are the categories explicitly excluded from review. Ball and strike calls are entirely immune from replay, a policy MLB has defended vigorously to preserve the integrity of pitch sequencing and game flow. Check swings, the infield fly rule, obstruction, interference rulings involving judgment calls, and balks are also non-reviewable. These exclusions reflect a deliberate philosophy: replay exists to correct factual errors caught on video, not to override the discretionary judgment that defines an umpire's expertise and authority.

One subtle but important distinction in the rulebook is the difference between a call that is confirmed and one that simply stands. Many fans — and some umpires — conflate the two. A confirmed call means replay officials found clear and convincing evidence that the original call was correct.

A ruling of stands means the evidence was not sufficient to overturn the call, but it does not necessarily mean the call was right — it means the bar of clear and convincing proof was not met. This nuance matters enormously in how umpires communicate outcomes and how managers interpret the results of their challenges.

The process of reviewing plays has also influenced how umpires are trained to position themselves. Modern umpire mechanics instructors emphasize getting the best possible angle on every play, in part because poor positioning can create ambiguous video that neither confirms nor overturns a call. An umpire who is correctly positioned — moving with the play, tracking the ball-glove relationship closely, and timing the call precisely — is far more likely to get the call right on the field and to have their original ruling upheld when reviewed in New York.

At the minor league and amateur levels, replay systems vary widely. Triple-A and Double-A baseball uses a version of the MLB replay system, while lower minor league levels rely on crew chief conference and limited video review when available. High school baseball governed by the NFHS does not permit replay review of any kind, and umpires at that level are trained to rely entirely on proper mechanics, positioning, and communication with fellow crew members. Collegiate baseball under NCAA rules similarly prohibits electronic review, though conferences may establish their own protocols for postseason play.

For umpires working multiple levels, this creates a practical challenge: knowing which rules apply in which context. A newly certified umpire working a summer collegiate league game operates under entirely different review parameters than one working a regional championship or a professional development league game. Certification programs across the country address this by teaching the underlying principles of reviewable versus non-reviewable calls at all levels, ensuring officials understand not just the rules but the reasoning behind them — which makes adapting to new environments far easier.

The data on replay accuracy is striking. Since the expanded system launched in 2014, MLB umpires have demonstrated call accuracy rates above 98% in most studies of reviewable play categories. The roughly 46% overturn rate on challenged plays sounds high, but it reflects the fact that managers are strategic about when they challenge — they tend to file challenges only when they have a strong visual sense the call was wrong.

When you account for all plays, the overwhelming majority of original calls stand without challenge or are upheld on review, a testament to the quality of modern umpire training and mechanics.

The crew chief occupies a uniquely powerful position within the umpire review system, and understanding how that authority works is essential both for aspiring crew chiefs and for every member of a four-umpire crew. When a manager approaches an umpire to file a challenge, that umpire does not respond independently — they direct the manager to the crew chief, who serves as the single point of contact for all replay-related communication. This protocol keeps the process orderly and prevents conflicting signals from reaching New York or the stadium announcer.

During the review itself, the crew chief dons a headset and steps away from the group to hear the ruling from the Replay Operations Center. The other three umpires position themselves to maintain game order: they watch the players, prevent any premature celebrations or disputes, and ensure both benches remain clear while the decision is pending. This positioning discipline is trained and deliberate — a replay stoppage can create tension on the field, and experienced crews know that professionalism during the wait communicates control and authority to everyone watching.

The crew chief's role extends beyond just relaying the ruling. They must decide, in the moment, whether a crew chief review is warranted when no manager challenge has been filed. This independent review authority — limited to home run determinations and select other categories in the seventh inning or later — requires the crew chief to exercise genuine judgment. They must weigh whether they have strong reason to believe the original call was wrong, because initiating an unnecessary review that comes back confirmed can undermine the crew's credibility and slow the game without cause.

When the ruling comes back from New York, the crew chief announces it with a specific hand signal and verbal declaration. An overturned call is announced clearly, with the base awards or outs resulting from the correct ruling stated explicitly. A confirmed call is announced with the original ruling restated. A ruling of stands uses specific language — the call stands — which communicates that the evidence was insufficient without implying the original call was correct. Learning these announcement protocols verbatim is a tested element of many professional development programs for aspiring crew chiefs.

One of the most underappreciated aspects of the crew chief role is managing the aftermath of a controversial ruling. When a call is overturned, the losing manager and players may be visibly frustrated. The crew chief must maintain composure, signal clearly, enforce the new ruling immediately, and prevent the situation from escalating. This requires not just rules knowledge but strong emotional intelligence and situational awareness. Great crew chiefs have a talent for de-escalating tension quickly, communicating respect even while holding firm on a difficult ruling, and keeping the game moving efficiently after a significant stoppage.

At the minor league and amateur levels, senior umpires take on many of the crew chief responsibilities described above, even without the formal title or MLB's headset infrastructure. Learning to think like a crew chief — anticipating reviews, managing crew communication, and owning the final ruling — is a professional growth mindset that pays dividends at every level of the game. Umpire development programs at every level recognize this and often structure training scenarios specifically around review management and crew leadership to develop these capabilities early in an official's career.

The data on crew chief accuracy and decision-making reflects how much this role has evolved since 2014. In the early years of expanded replay, crew chief reviews were initiated relatively rarely and with mixed outcomes. Today, experienced crew chiefs initiate reviews with much greater precision, selecting moments where the evidence is strong enough to justify the stoppage.

This calibration has come from years of institutional learning — comparing which types of plays tend to produce clear video evidence versus which remain ambiguous even with 20 camera angles available. That institutional knowledge now flows back into training programs, making each new generation of officials better prepared from day one.

For anyone preparing for an umpire certification exam, the replay review framework is among the highest-yield topics to study. State associations, professional development programs, and certification bodies increasingly test not just the rules governing replay but the procedural and philosophical dimensions: why certain calls are excluded, how the crew chief manages the process, how a manager challenge differs from a crew chief review, and what the correct verbal announcements are for each possible outcome. These are testable in both written and oral examination formats.

One of the most effective study approaches is to watch professional games specifically to observe how real crews handle reviews. Notice where each umpire positions themselves when a manager approaches to challenge. Watch how the crew chief separates from the group to use the headset. Observe the hand signals and verbal announcements used when the ruling comes back. Compare how crew dynamics shift during a review stoppage versus a standard inter-inning break. This kind of active observation builds a mental library of correct behavior that is far more durable on an exam than passive reading alone.

Practice exams are another indispensable tool. Many certification candidates underestimate how much the replay framework appears in game management scenarios and situational questions. A question might describe a specific play and ask whether it is reviewable, what the crew chief should do, or how the manager challenge rules apply. Being able to answer these quickly and accurately requires not just memorizing the rules but internalizing them deeply enough to apply them under exam pressure. The practice tests available through PracticeTestGeeks are specifically designed to build this kind of applied rules fluency.

Beyond the exam, a thorough understanding of the review system pays career dividends at every level. Umpires who demonstrate strong replay knowledge and crew management skills during evaluations are more likely to advance to higher-level assignments. In professional development programs, evaluators watch specifically for how umpires handle review situations — do they stay composed, communicate clearly, maintain crew positioning, and announce rulings with confidence and precision? These observable behaviors signal readiness for more prestigious and higher-stakes assignments.

The certification exam is also an opportunity to demonstrate knowledge about the philosophy behind the review system, not just its mechanics. Understanding why ball and strike calls are excluded — to preserve the discretionary nature of pitch evaluation and protect game flow — shows depth of understanding that distinguishes candidates who have truly internalized the rules from those who have simply memorized them. Evaluators value this depth because it predicts how an umpire will handle novel situations on the field where no rulebook answer is readily available.

Study resources for the review framework extend beyond the official rulebooks. MLB and its affiliated development programs publish annual updates to replay regulations, and reviewing these each spring is a best practice for any serious officiating candidate. The Professional Baseball Umpire Corporation (PBUC) and its successor organizations have published training materials on replay mechanics that are widely available and frequently referenced by certification programs at all levels. Supplementing rulebook study with these official materials ensures your knowledge is current, accurate, and aligned with how evaluators themselves think about the topic.

Finally, it is worth emphasizing that preparation for the certification exam and preparation to be a great on-field umpire are not separate endeavors — they are the same endeavor. The exam tests you on the same knowledge, judgment, and procedural fluency that will make you effective at every level of the game. Studying the replay review framework deeply does not just help you pass your test; it helps you walk onto the field with the confidence and competence to handle any situation the game throws at you, with or without a replay system available to catch your mistakes.

Building a structured study plan around the umpire review framework is the single best thing you can do to differentiate your exam performance. Most certification candidates spend the majority of their preparation time on batting rules, base running, and interference — all critical topics, but ones that tend to be well-covered by standard study materials. The replay system, crew chief authority, and game management under review conditions are comparatively underemphasized in many self-study guides, which means strong knowledge in this area gives you a genuine competitive advantage on the exam.

Start by reading Official Baseball Rule 8.02 in its entirety, including all appendices and supplements related to replay. The rule itself is relatively brief, but the associated replay regulations — updated annually by MLB — provide the procedural depth that certification exams test most heavily. After reading the primary materials, create a simple two-column chart: reviewable categories on one side, non-reviewable categories on the other. Quiz yourself on this chart daily for two weeks until you can reproduce it from memory without hesitation, because it appears in some form on nearly every advanced officiating exam in the country.

Next, study the three possible review outcomes — confirmed, overturned, and stands — and practice articulating each one with the exact language and signals used by MLB crews. Record yourself doing this on video if possible, then watch the playback critically. Your announcement should be crisp, authoritative, and immediate. Hesitation or imprecision in your verbal delivery signals uncertainty, which undermines your authority at any level of play. Professional evaluators pay close attention to announcement quality during practical examinations, and candidates who have clearly practiced their verbal delivery score significantly higher on these components.

Scenario-based practice is the next level of preparation. Create flashcards or study with a partner using play-by-play scenarios: a line drive that hits the left field foul pole, a tag play at second base on a stolen base attempt, a ball that bounces over the right field fence. For each scenario, ask yourself: is this reviewable?

Who initiates the review? What does the crew chief do during the review? What are the three possible outcomes and how does the crew chief announce each? Working through dozens of these scenarios builds the pattern recognition that allows you to respond instantly under game pressure and exam time constraints.

Do not neglect the philosophical and procedural dimensions of the review system in your preparation. Questions like why the infield fly rule is excluded from replay, or how the clear and convincing evidence standard differs from a preponderance of evidence standard, are more likely to appear on advanced certification exams than simple recall questions about reviewable categories. These questions test whether you understand the system well enough to reason about it, which is the highest level of mastery any exam can measure and the level that leads to the fastest career advancement in officiating.

Connect your replay study to your broader positioning and mechanics work. Every time you work on getting a better angle on a tag play or a force out, remind yourself that you are simultaneously improving your on-field accuracy and making your calls more camera-defensible. The two skills reinforce each other constantly.

Umpires who see positioning as purely a physical discipline — where to stand, how to move — miss the cognitive dimension: positioning is about putting yourself in the best possible position to be right, whether the verification comes from your own eyes or from a camera in New York watching the same play from a different angle.

Finally, use official practice exams early and often in your preparation cycle, not just in the final days before your test. Early use of practice exams reveals which concepts you understand at surface level versus which ones you have truly internalized. It also familiarizes you with the question formats, time constraints, and scenario structures that certification exams use, so there are no surprises on test day.

The combination of deep rulebook knowledge, regular scenario practice, and timed exam simulation is the preparation formula that consistently produces the highest certification pass rates among candidates who take the review framework seriously from day one of their study plan.