Isner stuns Federer in Davis Cup match (AP)

John Isner shocked Roger Federer 4-6, 6-3, 7-6 (4), 6-2, giving the United States a 2-0 lead against Switzerland in their Davis Cup first-round series on Friday. Isner’s big serve backed and booming ground strokes challenged the Swiss star in long rallies on the indoor clay court. The upset was preceded by a thrilling opening singles match, with Mardy Fish outlasting Stanislas Wawrinka 6-2,…

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