The Hammer grip is not a recognized grip style in tennis.

A tennis racket string dampener is used to reduce string vibration, which can improve control and feel.

The recommended air pressure for a tennis ball is 18-20 psi.

Carpet is not a common type of tennis court surface.

A server is a device used to serve a tennis ball.

A tennis racket cover is used to protect the racket from damage during storage or transportation.

Practice tennis balls are not a recognized type of tennis ball.

The center line divides the tennis court into two halves.

Running shoes are not designed specifically for tennis.

A ball hopper is a device used to pick up tennis balls.

Steel is not a common type of tennis string.

A serve meter is a device used to measure the speed of a tennis serve.

Wood is no longer a common material used in tennis racket frames.

A stringing machine is a device used to string a tennis racket.

White is not a common color for tennis balls.