Slice is created by the racket head brushing down the back of the ball.

The spin creates a lower, flatter trajectory over the net and makes the ball stay low off the bounce.

Slice it like Henman

Henman uses his backhand slice to approach the net; the spin keeps the ball low forcing his opponents to hit up giving him an easier volley.

The Williams sisters use the backhand slice as a defensive shot when stretched out wide. It's easier to play on the stretch and again the low bounce will make it more difficult for their opponents to attack.

Introduction

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Backhand grip