Robredo, Wawrinka advance
Robredo beat Rainer Schuettler of Germany 6-1, 6-4, and Wawrinka defeated Viktor Troicki of Serbia 6-2, 6-3.
Schuettler, the 2004 runner-up, won only 16 points in the first set and lost his serve five times.
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Philipp Kohlschreiber of Germany and Simone Bolelli of Italy also won. Kohlschreiber beat Ernests Gulbis of Latvia 6-1, 6-3 to set up a second-round match against seventh-seeded Fernando Verdasco of Spain.
"It's a very good start for the clay court season," Kohlschreiber said. "Overall I have to say I did everything right. I played a good match today."
Bolelli needed more than two hours to defeat big-serving Robin Soderling of Sweden 6-4, 1-6, 6-3.
Bolelli broke Soderling in the fourth game of the third set and then held for a 4-1 lead. He clinched the match with an ace on his second match point and next faces either ninth-seeded Gael Monfils of France or Janko Tipsarevic of Serbia.
The Spaniard has won the French Open and Monte Carlo every year since 2005 -- beating second-ranked Roger Federer in the last three finals at both events.
Nine of the top 10 players in the world are taking part this year, with only sixth-ranked Andy Roddick absent.
Federer accepted a last-minute wild card invitation Thursday. The 13-time Grand Slam champion married longtime girlfriend Mirka Vavrinec in a small ceremony in his hometown of Basel on Saturday.
Copyright 2009 by The Associated Press
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