Sam Stosur and Svetlana Kuznetsova were first up on the main two courts, and both won in straight sets. Juan Carlos Ferrero and Juan Martin del Potro soon followed on the same courts, and with similar results. And 2008 French Open champion Ana Ivanovic then made it 5 for 5.
The lone loser so far was Andy Roddick, the 2003 U.S. Open champion.
Roddick lost to 88th-ranked Nicolas Mahut 6-3, 6-3, 4-6, 6-2, exiting in the opening round of a Grand Slam tournament for the first time since 2007. The 26th-seeded Roddick is 7-10 this season, 0-4 on clay.
None of the top three men was in action on Day 1. Top-ranked Novak Djokovic and Roger Federer will be on court Monday, while Rafael Nadal is slated to begin his attempt for a record-breaking seventh French Open title on Tuesday.