MADRID, Spain (AP) -- Roger Federer played his first match on tour in more than five weeks, defeating American Robby Ginepri 7-6 (2), 6-4 Tuesday in the second round at the Madrid Masters.

Federer, the defending champion, was tested in the first set before winning his first match since capturing his fourth straight U.S. Open on Sept. 9. His only competition since the Open were two singles matches in the Davis Cup.

"I took a rest so I could be 100 percent here, and now I'm fresh and eager to play here again," said Federer, who hasn't lost to an American in four years, a streak of 39 matches.

The top-ranked Swiss will play the winner of Wednesday's match between Argentines Agustin Calleri and 13th-seeded Guillermo Canas. Calleri advanced after rallying for a 3-6, 7-6 (4), 6-4 win over Dimitry Tursunov.

David Nalbandian and Ivo Karlovic won first-round matches while Nikolay Davydenko withdrew because of an injured right elbow. Nalbandian rallied past Arnaud Clement 5-7, 6-2, 6-4, and Karlovic served 17 aces in beating Marat Safin 6-3, 6-4. Karlovic, 6-foot-10, had one serve that reached 136 mph.

Davydenko, seeded fourth, said his injury made it "too dangerous" for him to play this week. He will fly to Germany on Wednesday for therapy in an attempt to play at the St. Petersburg Open. The Russian qualified for the Masters Cup in Shanghai with his Kremlin Cup victory Sunday.

"I try as hard as possible to recover for the next week," he said.

Federer served two consecutive aces to thwart Ginepri's double-break chance in the seventh game of the first set. Ginepri, a 72nd-ranked qualifier, forced Federer into 17 of his 30 unforced errors in the first set as both players held serve to the tiebreaker, which Federer clinched with one of his 10 aces.

In the second set, Federer scored the decisive break in the fifth game, lobbing his return over Ginepri as he came to the net.

"I was struggling in the beginning a little bit, but I served well to get out of trouble," Federer said. "I'm happy I won this first match, for me it was a big win today."

Juan Ignacio Chela and Tommy Haas were the first seeded players to be eliminated from the tournament.

Andy Murray played near perfectly in the first set before holding off the 15th-seeded Chela 6-1, 6-3. Juan Monaco had to work a little harder in a 6-4, 7-5 win over the 11th-seeded Haas.

Also, 2003 champ Juan Carlos Ferrero beat qualifier Alejandro Falla 6-4, 7-5; Paul-Henri Mathieu held off Mardy Fish 6-3, 2-6, 7-5; Nicolas Kiefer defeated Stanislas Wawrinka 7-5, 6-3; and Nicolas Almagro downed Fabrice Santoro 6-4, 6-4.

Copyright 2007 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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