The United States reached the Davis Cup quarter-finals here on Saturday when the doubles pairing of Mike Bryan and Mardy Fish gave them an unbeatable 3-0 lead over hosts Switzerland.
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The Americans defeated Olympic champions Roger Federer and Stanislas Wawrinka 4-6, 6-3, 6-3, 6-3 to secure the winning point.
In Friday's opening two rubbers, Fish defeated Wawrinka in five sets and John Isner upset Federer in four.
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