Safin could meet Roger Federer in the quarter-finals
27 May-10 June
TV: Coverage on BBCi throughout tournament, singles finals on BBC One and Two
Radio: Commentary on Five Live Sports Extra, 4-6 June; commentary on singles finals on Five Live
Web/Mobile: Results, draws, reports, news, features
Marat Safin reached the second round of the French Open before heavy rain caused a six-hour delay.
Safin needed only one hour 24 minutes to power past Spain's Fernando Vicente 6-1 6-3 6-1 and predicted he could be a dangerous proposition in Paris.
"My form coming into the tournament wasn't even ups and downs, it was just downhill," said the 27-year-old.
"Here is a different story. Even though you might feel you're not playing well, you have enough time to catch up."
The Russian next faces Janko Tipsarevic, who beat fellow Serb Dusan Vemic 7-6 (7-3) 6-4 4-6 6-3.
Italian Potito Starace overcame Ivo Minar 4-6 6-1 6-4 7-6 (7-5) in the only other men's match to be completed on the opening day of the tournament.
Top seed Roger Federer opens his campaign on Monday, while defending champion Rafael Nadal must wait until Tuesday, along with Britain's Tim Henman.