"I felt that we could come through this one and it's a partnership that I hope will continue."
Seventh seeded American James Blake became the highest rated player to be knocked out when he lost his second round match 7-6,3-6, 7-5, 6-3 to Latvia's Ernests Gulbis, who beat Tim Henman last year.
In the women's event, former champion Venus Williams had few problems as she advanced to the third round with a 6-2, 6-4 win over Tunisia's Selima Sfar.
The elder Williams sister, now 27 and winner at Roland Garros nine years ago, made a sloppy 25 unforced errors but was still far too strong for Sfar.
Her next opponent will be 26th seed Flavia Pennetta of Italy, who beat Russia's Anastasia Pavlyuchenkova 3-6, 6-1, 6-1.
Williams' serve was broken to put her behind 2-1, but she didn't drop another game until leading 1-0 in the second set. Williams was dominant at the net, winning 24 of the 35 points during which she went forward.
