Acing It

In tennis, an ace is a legal serve that is not touched by the receiver, winning the point. In professional tennis, aces are generally seen on a player's first serve, where the server can strike the ball with maximum force and take more chances with ball placement, such as the far corners of the service box. This makes returning the shot almost impossible and hence wins the server a point.

Why the difference?

Wimbledon, played on grass courts, supports fast game. The ball preserves most of its speed on bounce and hence it gives very less reaction time to the opposing player to react. It is completely opposite of clay court used in French open which slows down the ball after bounce. Therefore we observe that average number of aces scored in a match is highest in Wimbledon and least in French Open. The number of Aces scored on different types of hard courts fall in between because their surface properties falls somewhere in between