Remember to take your serves all at the same time in the 5-minute match warmup. Play must be continuous once the match begins. In the 5 minute warmup when your opponent asks for a few lobs to practice their overhead, do not try to return their smash with a lob. Instead, catch it with your racket, then feed them another lob. This prevents the spraying of the overhead off your racket, thus prolonging the warmup. During the warmup, rather than trying to practice your shots, focus on using the time to loosen up your body and mentally prepare yourself for the match.