Angelique Kerber of Germany attends to Simona Halep after Halep is forced to retire with injury from the second round of the 2021 Internazionali BNL d'Italia WTA 1000 tournament Italian Open, Tennis, Foro Italico, Rome, Italy - 12 May 2021,Image: 610527897, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia

Romania's Simona Halep servesl to Spain's Sara Sorribes during their match at the Mutua Madrid Open tennis tournament in Madrid, Spain, Friday, April 30, 2021. (AP Photo/Bernat Armangue)

Simona Halep of Romania during her first round match at the 2021 Mutua Madrid Open WTA 1000 tournament Mutua Madrid Open, Tennis, La Caja Magica, Madrid, Spain - 30 Apr 2021,Image: 608727513, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia