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GENEVA, SWITZERLAND - SEPTEMBER 22: Stefanos Tsitsipas and playing partner Roger Federer of Team Europe celebrate in their doubles match against John Isner and Jack Sock of Team World during Day Three of the Laver Cup 2019 at Palexpo on September 22, 2019 in Geneva, Switzerland. The Laver Cup will see six players from the rest of the World competing against their counterparts from Europe. Team World is captained by John McEnroe and Team Europe is captained by Bjorn Borg. The tournament runs from September 20-22. (Photo by Clive Brunskill/Getty Images for Laver Cup )

GENEVA, SWITZERLAND - SEPTEMBER 22: Stefanos Tsitsipas and playing partner Roger Federer of Team Europe celebrate in their doubles match against John Isner and Jack Sock of Team World during Day Three of the Laver Cup 2019 at Palexpo on September 22, 2019 in Geneva, Switzerland. The Laver Cup will see six players from the rest of the World competing against their counterparts from Europe. Team World is captained by John McEnroe and Team Europe is captained by Bjorn Borg. The tournament runs from September 20-22. (Photo by Clive Brunskill/Getty Images for Laver Cup )