How does electronic line calling work at WTA events?

Under the 2026 WTA Rulebook, all WTA 1000, WTA 500 and WTA 250 tournaments, on any surface, must use a WTA-approved live electronic line calling (Live ELC) system. It must be available on all match courts from the first day of qualifying until the end of the tournament.

• Live ELC makes the "out" calls itself, through an audio system connected to the court, without players needing to challenge.
• Each court must have a scoreboard and videoboard where the chair umpire, players and spectators can see the score and close call replays.
• A certified review official approved by WTA Officiating monitors the system. If it fails or its ability to make a call is in question, the chair umpire tells both players that Live ELC is unavailable until further notice and play is suspended.

The men's ATP rulebook could not be checked for this guide.