First, Mardy Fish put together a compelling rally to get the United States off to a fast start. Then John Isner bashed his way to a big upset. Now Roger Federer and company are on the ropes. Isner jolted Federer with his big serve and booming groundstrokes Friday, winning 4-6, 6-3, 7-6 (4), 6-2 to give the U.S.
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