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Spanish player Rafael Nadal returns the ball to his compatriot Pablo Carreno Busta in their tennis match during the Qatar Open tournament on January 5, 2016, in Doha. AFP PHOTO / KARIM JAAFAR / AFP / KARIM JAAFAR (Photo credit should read KARIM JAAFAR/AFP/Getty Images)

Spanish player Rafael Nadal returns the ball to his compatriot Pablo Carreno Busta in their tennis match during the Qatar Open tournament on January 5, 2016, in Doha. AFP PHOTO / KARIM JAAFAR / AFP / KARIM JAAFAR        (Photo credit should read KARIM JAAFAR/AFP/Getty Images)