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In this photo taken on October 17, 2015, Rafael Nadal of Spain uses a towel during a change-over in his men's singles semi-final match against Jo-Wilfried Tsonga of France at the Shanghai Masters tennis tournament in Shanghai. AFP PHOTO / GREG BAKER (Photo credit should read GREG BAKER/AFP via Getty Images)

In this photo taken on October 17, 2015, Rafael Nadal of Spain uses a towel during a change-over in his men's singles semi-final match against Jo-Wilfried Tsonga of France at the Shanghai Masters tennis tournament in Shanghai. AFP PHOTO / GREG BAKER        (Photo credit should read GREG BAKER/AFP via Getty Images)