In tennis, a Heavy (Ball) is a shot hit with a strong force and lots of topspin. It travels fast and spins rapidly through the air. When it bounces, the ball jumps high and moves quickly.
Players receiving a heavy ball feel like it's hard to control. It can push them back or make their racket twist. Heavy balls are often hit with forehands. They require good technique and strength to produce.
Heavy balls are effective for putting pressure on opponents. They can make it difficult for the other player to attack.