Winner Simona Halep, of Romania, left, and second placed Serena Williams pose with their trophies after the women's singles final match on day twelve of the Wimbledon Tennis Championships in London, in this Saturday, July 13, 2019, file photo. There are plenty of intriguing story lines to follow on the grass courts. That includes Novak Djokovic's bid to equal Roger Federer and Rafael Nadal at 20 major titles and Serena Williams seeking her 24th. (AP Photo/Tim Ireland, File)

FILE - Security guards are shown at the gate in front of Centre Court at the All England Lawn Tennis Club, after the 2020 tennis championships were canceled due to the coronavirus, in Wimbledon, London, in this Monday, June 29, 2020, file photo. The oldest Grand Slam tennis tournament was the only one that was canceled in 2020 because of the coronavirus pandemic. It was the first time since World War II that Wimbledon was not held. (AP Photo/Kirsty Wigglesworth, File)

FILE - Serbia's Novak Djokovic, left, and Switzerland's Roger Federer pose with the trophies after the men's singles final match of the Wimbledon Tennis Championships in London, in this Sunday, July 14, 2019, file photo. There are plenty of intriguing story lines to follow on the grass courts. That includes Novak Djokovic's bid to equal Roger Federer and Rafael Nadal at 20 major titles and Serena Williams seeking her 24th. (AP Photo/Tim Ireland, File)