Line judges will no longer feature at the U.S. Open after the United States Tennis Association (USTA) said on Monday that it was implementing the use of electronic line calling on all courts at ...

Electronic line judging has replaced humans at the U.S. Open. But the voices making calls are real people, recorded with varying levels of urgency to sell the call, depending on how close the shot is.

BBC Sport's Ask me Anything team explains why the French Open is yet to use an electronic line calling system and still relies on line judges and decisions by umpires.