Kevin Anderson avenged a Wimbledon finals loss to Novak Djokovic as Team World dominated the night session Saturday to climb back into contention at the 2018 Laver Cup.
Federer, 20-time Grand Slam victor, dispatched Nick Kyrgios 6-2, 6-3 to earn two points while Alexander Zverev beat John Isner 3-6, 7-6 (8/6), 10-7 (10-point tie-break) to extend the European lead to 7-5.
Following Anderson's match with Djokovic, Sock and Kyrgios joined forces to win the day's doubles match, beating Bulgaria's Grigor Dimitrov and Belgium's David Goffin 6-3, 6-4. The match also a hilarious moment play out between them when Djokovic accidentally struck the ball on Federer's waist.
American duo John Isner and Jack Sock fought off two match points to defeat Zverev and world number two Roger Federer in a gripping doubles battle.
The exhibition event is taking place on U.S. soil for the first time and features 12 of the world's top players squaring off against each other in a three-day team event in Chicago.
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But he said there had been occasions when things had not gone smoothly, calling Syria's downing of the Russian plane "tragic". The Kremlin said Russia's decision was not targeted against anyone and only serves to protect Russian troops in Syria.
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David de Gea came to United's rescue after seven minutes, as he produced a superb save to deny Raul Jimenez from 10-yards out. The draw keeps Wolves one point behind Manchester United in 10th, as Mourinho's side climb to fifth.
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Team Europe needs 13 points to retain the trophy. In the event of split sets, the third set is a 10-point match tiebreaker. The Bulgarian, Grigor Dimitrov swept aside Frances Tiafoe from the US 6-1, 6-4.
The second edition of the Laver Cup is going down in Chicago this weekend.
"To team up with somebody of his calibre is just a treat you know", he said.
"I don't think she will remember it", he joked.
Europe skipper Bjorn Borg meanwhile praised the performance of the World team, who were captained by his old rival John McEnroe.
Federer and Djokovic have played each other 46 times and have a combined 24 Grand Slam titles; but they have rarely spent time on the same side of the net, outside of a handful of exhibitions and charity events.