In the UK, the LTA, basically the UK tennis governing body has a rule:
If a player serves out of turn during a standard game, the player who was originally due to serve will serve as soon as the error is discovered. However, if a game is completed before the error is discovered the order of service will remain as altered.
I am trying to understand how this would work in the case that the error is discovered after an out of sequence serve.
Scenario is we have player A and player B, A wins toss and decides to serve first. What happens if A serves for game 1 and A serves for game 2, then at the end of game 2 they realise that A should not have served game 2. Does A go onto serve game 3 and they then carry on as normal, or does B serve game 3 and they then carry on alternating.