Team Europe's applaud to Roger Federer ahead of day one of the Laver Cup at the O2 Arena in London, Friday, Sept. 23.
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Team Europe's Novak Djokovic, Rafael Nadal and Roger Federer line up on the court ahead of day one of the Laver Cup at the O2 Arena in London, Friday, Sept. 23.
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ASSOCIATED PRESS
Team Europe's Casper Ruud celebrates with teammates after winning a match against Team World's Jack Sock on day one of the Laver Cup tennis tournament at the O2 in London, Friday, Sept. 23.
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Team Europe's Roger Federer of Switzerland, waves during the match of Team Europe's Casper Ruud against Team World's Jack Sock on day one of the Laver Cup tennis tournament at the O2 in London, Friday, Sept. 23.
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Team Europe's Roger Federer, right, and Rafael Nadal wave as they arrive for their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Roger Federer, right, and Rafael Nadal react during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team World's Jack Sock, right, and Frances Tiafoe play a return against Team Europe's Roger Federer and Rafael Nadal during their Laver Cup doubles match at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Roger Federer playing with Rafael Nadal makes a return during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Roger Federer, right, and Rafael Nadal chat during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Roger Federer, front, and Rafael Nadal in action during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team World's Jack Sock, right, and Frances Tiafoe react after winning a point against Team Europe's Roger Federer and Rafael Nadal during their Laver Cup doubles match at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Rafael Nadal playing with Roger Federer makes a return during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Roger Federer playing with Rafael Nadal reacts after winning a point during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Roger Federer, center, and Rafael Nadal get support from their teammates during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.
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Team Europe's Roger Federer, front left, and Rafael Nadal react during their Laver Cup doubles match against Team World's Jack Sock and Frances Tiafoe at the O2 arena in London, Friday, Sept. 23.