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Spain's Rafael Nadal changes his t-shirt during a break in play against Luxembourg's Gilles Muller during their men's singles fourth round match on the seventh day of the 2017 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 10, 2017. / AFP PHOTO / Glyn KIRK / RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP/Getty Images)

Spain's Rafael Nadal changes his t-shirt during a break in play against Luxembourg's Gilles Muller during their men's singles fourth round match on the seventh day of the 2017 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 10, 2017. / AFP PHOTO / Glyn KIRK / RESTRICTED TO EDITORIAL USE        (Photo credit should read GLYN KIRK/AFP/Getty Images)