How Basketball Coach’s Challenges Work Explainer
The NBA Coach’s Challenge lets a head coach trigger instant replay for a limited set of calls. The review can address a personal foul called on the challenging team, an out-of-bounds ruling that denied it possession, or a called goaltending or basket-interference violation within the rule’s timing limits.
To challenge, the team generally must call a legal timeout immediately and the coach must make the replay signal while identifying the specific call. The request must come before play resumes. Non-calls and many other violations, including traveling or three seconds, cannot be challenged.
Each team starts with one challenge. If the first is successful, the team receives a second. A failed challenge costs the timeout used, while timeout treatment after successful first and second challenges follows the detailed rule. Clear and conclusive visual evidence is required to overturn the ruling.
The review may examine closely connected matters defined by Rule 14, not just one frozen frame. That can affect possession, the responsible player, clock time, continuation, or a proximate foul. Coaches balance the value of correcting a call against the timeout and the possibility of a more important moment later.
A foul called on the challenging team, certain out-of-bounds rulings, and called goaltending or basket interference.
No. A Coach's Challenge applies only to the specific called events listed in Rule 14.
Its first challenge must be successful and the original call must be overturned under the rule's standard.
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