Player Challenge System
Players have unlimited opportunity to challenge, but once three incorrect challenges are made in a set, they cannot challenge again until the next set. If the set goes to a tie break, players are given additional opportunities to challenge
Each player/team is allowed a maximum of three incorrect challenges in a normal set after which they are not permitted to challenge again in that set.
If a set goes to a tie-break, this limit of incorrect challenges is increased from three to four for the set.
Challenges may not be carried over from one set to another