CHICAGO, IL - SEPTEMBER 18: Roger Federer of Team Europe in action during a practice session prior to the Laver Cup at the United Center on September 18, 2018 in Chicago, Illinois.The Laver Cup consists of six European players competing against their counterparts from the rest of the World. Europe will be captained by Bjorn Borg and John McEnroe will captain the Rest of the World team. The event runs from 21-23 Sept. (Photo by Clive Brunskill/Getty Images for The Laver Cup)
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