Germany's Alexander Zverev celebrates a point against Italy's Matteo Berrettini during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Germany's Alexander Zverev holds the trophy after winning the men's final match against Italy's Matteo Berrettini at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Germany's Alexander Zverev returns the ball to Italy's Matteo Berrettini during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Germany's Alexander Zverev celebrates a point against Italy's Matteo Berrettini during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Italy's Matteo Berrettini prepares to serve to Germany's Alexander Zverev during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Germany's Alexander Zverev returns the ball to Italy's Matteo Berrettini during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Italy's Matteo Berrettini returns the ball to Germany's Alexander Zverev during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Germany's Alexander Zverev returns the ball to Italy's Matteo Berrettini during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Italy's Matteo Berrettini serves to Germany's Alexander Zverev during the men's final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Spain's Marcel Granollers, right, and Horacio Zeballos of Argentina celebrate after winning the men's doubles final match against Croatia's Nikola Mektic and Mate Pavic at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Spain's Marcel Granollers, left, and Horacio Zeballos of Argentina celebrate after winning the men's doubles final match against Croatia's Nikola Mektic and Mate Pavic at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)

Croatia's Nikola Mektic, left, and Mate Pavic hold second place trophies after losing the men's doubles final match against Spain's Marcel Granollers and Horacio Zeballos of Argentina at the Mutua Madrid Open tennis tournament in Madrid, Spain, Sunday, May 9, 2021. (AP Photo/Bernat Armangue)