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Team Europe's Novak Djokovic stands behind an emotional Roger Federer after Federer played with Rafael Nadal in a Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23, 2022. Federer's losing doubles match with Nadal marked the end of an illustrious career that included 20 Grand Slam titles and a role as a statesman for tennis. (AP Photo/Kin Cheung)