I had to play a few no-ad matches recently, which is new for me. Nothing weird happened, but a question did occur to me. You get to deuce, and the receiving team decides who will receive. Server hits a first serve, which clips the net and lands in. Receivers say "Let, first serve." Can the receivers then decide to change who will receive serve before the server repeats the first serve attempt? How about if the receivers make their election and the point begins, but a ball rolls on court half-way through? Can the receivers change their election when the point is replayed?