(AP Photo/Keystone, Laurent Gillieron)

FRIBOURG, Switzerland (AP) The United States completed its 5-0 rout of Switzerland in the first round of the Davis Cup on Sunday, with 19-year-old Ryan Harrison and John Isner winning the closing singles matches.

Harrison made his Davis Cup debut, defeating Michael Lammer 7-6 (0), 7-6 (4) to extend the Americans' lead to 4-0. Isner, who stunned Roger Federer in four sets Friday, then beat Marco Chuidinelli 6-3, 6-4 to give the U.S. its first sweep since a 2004 first-round series against Austria.

"It was really exciting to be out there," Harrison said. "To be part of this week was a huge experience."

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