Andy Roddick slumped to a fifth French Open first round defeat on Sunday when the injury-plagued American lost 6-3, 6-3, 4-6, 6-2 to France's Nicolas Mahut.
Former US Open champion Roddick, who has never got beyond the third round in Paris in 10 visits, came into Roland Garros having made his season's European claycourt bow only in Dusseldorf last week where he lost all three matches.
Now ranked at 29 in the world, Roddick has been battling hamstring problems for most of the year.
World 88 Mahut has now equalled his best French Open performance having also made the second round in 2010.
Stosur, Ivanovic win
US Open champion Samantha Stosur had the honour of being the first player into the French Open second round at a sweltering Roland Garros on Sunday, brushing aside Britain's Elena Baltacha.
Australian sixth seed Stosur, the 2010 runner-up to Francesca Schiavone, took just a over an hour to see off the 68th-ranked Baltacha 6-4, 6-0 on Philippe Chatrier court.
Joining Stosur in the next round was Russia's Svetlana Kuznetsova. The 2009 champion, seeded 26 this year, marked her 40th Grand Slam appearance with a comfortable 6-1, 6-3 win over Croatian world number 117 Mirjana Lucic.
New Partner for Paes
India's Leander Paes will be teaming up with Alexander Peya from Austria at the French Open. Peya, the 31-year old, is 20th on the ATP doubles rankings, but the duo enters the French Open as seventh seeds. It will be the first time ever that the pair will team up together on the ATP circuit. They face the unseeded Italian pair Simon Bolelli and Fabio Fognini in the first round. Paes' regular doubles partner Radek Stepanek does not feature in the doubles draw.