Roger Federer and Alexander Zverev have won their Laver Cup doubles match.
The duo's straight sets victory over Jack Sock and Denis Shapovalov results in Team Europe leading Team World 3-1 after day one in Switzerland.
Earlier on the opening day Shapovalov went down to Dominic Thiem.
Meanwhile, Greece's Stefanos Tsitsipas easily triumphed over American Taylor Fritz.

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