Tennis ploys are strategies used by players to gain an advantage over their opponents. The most common tennis ploy is the lob, which is a high-arcing shot that is hit over the opponent's head and lands near the back of the court. This shot is often used to force the opponent to move back and give the player more time to set up for the next shot. It can also be used to disrupt the opponent's rhythm and create an opening for a winning shot.