What Is TTR in Table Tennis? The Review System Explained
TTR stands for the Table Tennis Review System, a video replay tool ITTF and WTT use at top events so players can challenge specific calls like edge balls, service faults and obstruction. Each player gets two challenges per match, reviewed on multi-angle camera footage by a dedicated official, not the on-court umpire. It is a narrow, specific tool, not a general "argue with the umpire" button, and it is nothing to do with the expedite system, which is a separate scoring rule covered in its own article here.
Why "TTR" Confuses People in the First Place
Search "TTR table tennis" and you will land on at least two unrelated concepts wearing the same three letters. There is the Table Tennis Review System this article covers, the official video challenge tool. And there is an older, completely separate use of the same initials: Tischtennis-Rating, a German-origin player rating number that many European and some Indian club players still quote informally to describe playing strength, similar to a chess rating. If someone tells you their "TTR is 1800," they almost certainly mean the rating, not the review system. This article is about the review system only, the official video challenge tool used at the sport's top level.
What the Table Tennis Review System Actually Does
TTR lets a player formally challenge an umpire's call on a narrow, defined list of situations, using multiple camera angles and slow-motion replay to check whether the original decision was correct. It is table tennis's version of the challenge systems you have seen in tennis (Hawk-Eye) or cricket (DRS), built specifically around the calls that are genuinely hard to see in real time at full speed.
It was first trialled at the ITTF World Tour Grand Finals in 2019, returned for a successful trial at the ITTF Mixed Team World Cup in Chengdu in 2024, and an enhanced version was used at the ITTF World Cup in Macao in 2025. ITTF and WTT have continued rolling it out at a growing number of top-tier events since.
Every Reviewable Call, Visualised
TTR is not a general "argue with the umpire" button. The reviewable list is specific, seven situations, and no others. Here is exactly what each one looks like on the table.
Edge Ball
The ball clips the very corner edge of the table rather than flying past it. Still a live, legal shot, but at full speed the human eye often can't tell an edge touch from a near miss.
Service Net
Did the serve clip the net assembly on its way over? If it did but still lands legally, it's a let. Reviewed to confirm genuine net contact, not a shadow or a sound.
Toss Height
The serve toss must rise at least 16cm above the free hand's palm before being struck. A toss that barely rises is one of the most common fast-serve violations.
Toss Angle
The toss must stay within 30 degrees of vertical in every direction. A toss flicked sharply forward or sideways to disguise the serve crosses the legal cone.
Ball Visibility
The server's free arm, body or anything they wear must not hide the ball from the receiver during the toss and strike. Reviewed when the receiver's sightline looks blocked.
Toss Landing Zone
The toss must rise and fall without touching anything before being struck, and must not land short, below, or inside the playing surface itself before contact.
Obstruction
A player, or anything they wear or carry, touches the ball while it's still travelling toward their opponent's side and hasn't bounced there yet. Reviewed to see exactly where the ball was when contact happened.
Each Player Gets Two Reviews
Every player or pair starts a match with two reviews. A successful or inconclusive challenge does not cost anything. Only a challenge that confirms the umpire was right in the first place uses one up. Run out of reviews, and you simply cannot challenge again for the rest of that match, correct call or not.
Curious how officiating actually works without a TTR safety net, including who really has the power to stop a rally in the first place? Our companion piece on lets, obstruction and appeal rules covers exactly that, with real match footage. And if you've ever wondered why some matches suddenly speed up with the server changing every point, that's the completely separate expedite system, not TTR at all.
Frequently Asked Questions
What does TTR stand for in table tennis?
TTR stands for Table Tennis Review System. It is a video review tool used at top ITTF and WTT events that lets players challenge specific umpire decisions, such as edge balls, service faults and obstruction, using multi-angle camera footage. It is unrelated to the separate German-origin TTR rating number some club players use to describe playing strength.
How many challenges does each player get under TTR?
Each player or pair gets two reviews per match. A successful or inconclusive challenge does not cost a review. Only an unsuccessful challenge, where the original decision is upheld, uses one up.
What can you challenge under the Table Tennis Review System?
Reviewable situations include edge balls, the serve touching the net, service toss height below 16cm, service toss angle beyond 30 degrees, the ball being hidden during service, the toss landing below or inside the playing surface, and obstruction. General rally decisions and umpire judgement calls outside this list cannot be challenged.
Is TTR used at every table tennis tournament?
No. TTR requires multiple high-speed cameras and a dedicated review official, so it only appears at the top tier of ITTF and WTT events, and sometimes only on the main show court rather than every table at a venue. The vast majority of national, state, school and club tournaments, including almost everything played in India, has no TTR and relies entirely on the umpire's on-court decision.
What is an edge ball and why is it hard to call?
An edge ball is a shot that clips the very corner edge of the table rather than the top playing surface, which is still a legal, live shot. It is one of the hardest calls in table tennis because at full speed the human eye often cannot distinguish a ball that touched the edge from one that flew past it, which is exactly why it is one of the most commonly challenged situations under TTR.
What happens if a TTR challenge is inconclusive?
An inconclusive review, where the footage does not give clear evidence either way, results in the original umpire's call standing, but it does not cost the challenging player a review. Only a challenge that clearly confirms the umpire was right in the first place uses one up.
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