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CHICAGO, IL - SEPTEMBER 23: Team Europe Roger Federer of Switzerland celebrates after defeating Team World John Isner of the United States during their Men's Singles match on day three of the 2018 Laver Cup at the United Center on September 23, 2018 in Chicago, Illinois. (Photo by Matthew Stockman/Getty Images for The Laver Cup)

CHICAGO, IL - SEPTEMBER 23:  Team Europe Roger Federer of Switzerland celebrates after defeating Team World John Isner of the United States during their Men's Singles match on day three of the 2018 Laver Cup at the United Center on September 23, 2018 in Chicago, Illinois.  (Photo by Matthew Stockman/Getty Images for The Laver Cup)