Angelique Kerber, the world No 1, has already been dumped out of the French Open and, as is the custom at Roland Garros, a host of the worlds top players are expected to follow. As the only major played on clay, the contrast between the experts and the pretenders is starker than anywhere else in the world.

Forehand Most of the worlds best forehands - Rafael Nadals in particular - have been built on the western forehand grip, where the racket is held at an angle that allows the player to generate extra topspin by rotating the wrist over the ball at the point of impact. On clay, where the ball holds up off the surface, a heavy topspin forehand generates extra bounce, pushing opponents out of

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Nadal's forehand; Muguruza's slice: anatomy of a clay-court specialist - The Times (subscription)