After the receiving team returns the serve, is it permissible for players to swap left and right sides with their partners multiple times during the point? I always thought this was allowed – poaching would be one example of this. A friend of mine was chastised by an onlooker during his doubles play for swapping sides with his partner too much. (They play one-up, one-back.) Said they are only allowed to swap one time during a point, after that anymore is illegal. Anyone know the exact rule on this?