Kinetic Score
Apple Watch on its own: no phone needed on court.
Tap to score, glance to check. Sets, games and points on your wrist, with calories and heart rate from the match.
Kinetic Button
iPhone with Apple Watch, or a Flic button on your racket bag.
One tap for your point, two for theirs, hold to undo. The iPhone says the score out loud, and with Kinetic Stream the watch can start and stop the recording too.