Tennis, Italian Open. Il Foro Italico. (Reuters/Matteo Ciambelli)

Rafael Nadal. (AP Photo/Gregorio Borgia)

Novak Djokovic e Rafael Nadal.(Photo by Filippo MONTEFORTE / AFP)

(Photo by Filippo MONTEFORTE / AFP)

Rafael Nadal. (AP Photo/Gregorio Borgia)

Rafael Nadal. (Photo by Filippo MONTEFORTE / AFP)

Rafael Nadal.(AP Photo/Gregorio Borgia)

(COMBO) A combo of images showing Novak Djokovic of Serbia reacting after loosing a point against Rafael Nadal of Spain during their ATP Masters tournament final tennis match at the Foro Italico in Rome on May 19, 2019. (Photo by Filippo MONTEFORTE / AFP)

Novak Djokovic. (Photo by Tiziana FABI / AFP)

Novak Djokovic. (Photo by Tiziana FABI / AFP)

Novak Djokovic. (Ansa / Ettore Ferrari)

Novak Djokovic. (AP Photo/Gregorio Borgia)

Novak Djokovic. (Ansa / Ettore Ferrari)

Novak Djokovic. (AP Photo/Gregorio Borgia)

Rafael Nadal. (AP Photo/Gregorio Borgia)

Rafael Nadal. (Reuters/Matteo Ciambelli)

Novak Djokovic. (Reuters/Matteo Ciambelli)

Rafael Nadal. (Reuters/Matteo Ciambelli)

Novak Djokovic. (Ansa/Ettore Ferrari)

Novak Djokovic. (Photo by Tiziana FABI / AFP)

Rafael Nadal. (Photo by Tiziana FABI / AFP)

Rafael Nadal. (Photo by Tiziana FABI / AFP)

Tennis, Italian Open. Il Foro Italico. (Reuters/Matteo Ciambelli)