FILE- In this Monday, May 25, 2009, image, Spain's Rafael Nadal slides in the clay as he returns the ball to Brazil's Marcos Daniel during a first round match at the Roland Garros stadium in Paris. Sliding is one of the keys to success at the French Open, with the ability to glide along the ground to reach shots that others can't, is one of the skills that makes Rafael Nadal so successful on clay courts, although the start of the French Open postponed until September because of the coronavirus. (AP Photo/Christophe Ena, File)

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