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)
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