KEY BISCAYNE, FL - APRIL 02: Simona Halep of Romania talks to the umpire during the change over against Serena Williams of the United States in their semi final match during the Miami Open Presented by Itau at Crandon Park Tennis Center on April 2, 2015 in Key Biscayne, Florida. Clive Brunskill,Image: 236281309, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia

Danielle Collins, of the United States, gets medical attention during her match against Simona Halep, of Romania, during second round of play at the National Bank Open tennis tournament Wednesday August 11, 2021 in Montreal. Ten National Bank Open, Montreal, Canada - 11 Aug 2021,Image: 626670731, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia

Simona Halep of Roumania tosses her racket during her match against Danielle Collins of the United States during second round of play at the National Bank Open tennis tournament Wednesday August 11, 2021 in Montreal. Ten National Bank Open, Montreal, Canada - 11 Aug 2021,Image: 626671304, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia

MONTREAL, QC - AUGUST 11: Simona Halep of Romania looks on after returning the ball during her Women's Singles second round match against Danielle Collins of the United States on Day Three of the National Bank Open presented by Rogers at IGA Stadium on August 11, 2021 in Montreal, Canada. Minas Panagiotakis,Image: 626667722, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia