PARIS -- Former world champion Tyson Gay ran 10.04 seconds in pouring rain to win the 100 meters at the Montreuil meeting on Monday.
Gay crossed the finish line 0.12 clear of 2008 Olympic runner-up Richard Thompson with a 0.5-meter headwind.
"I definitely want to get to 9.8-9.7 shape," Gay said. "It may take a couple more races to get down there."
The American sprinter made his return from a one-year doping ban last week, finishing second in 9.93 behind Justin Gatlin at the Athletissima meeting in Switzerland.
"I felt better today than I did in Lausanne," Gay said. "My start was better in Lausanne, but here I felt better in the race."
Gay, the 2007 world champion, tested positive last year for an anabolic steroid. He cooperated with the U.S. Anti-Doping Agency's investigation to have his doping suspension reduced to one year.
"It was tough last year, but I didn't take off the training," Gay said, "I continued to train and work through ups and downs of last year. I managed to make it through."
Gay is the second fastest sprinter in the 100 behind Usain Bolt. He said his doping suspension was a learning experience.
"I'm learning to be more responsible," Gay said. "As an athlete, you have to be responsible for your supplements."
He plans to race at least until the Rio Games in 2016.
"That's motivation for me," Gay said. "That's my goal. I'm looking forward to that."
Michelle-Lee Ahye, who is the best performer in the women's 100 this year, overcame a poor start to beat Carrie Russell in 11.32, while Olympic champion Sanya Richards-Ross pulled away in the final straight to win the 400 in 51.12.
"I think the last time I ran in weather like this is probably Zurich 2005," Richards-Ross said. "I tried to block it out, but it's really hard to get going really fast, especially the first 50. A little bit more cautious. I do want to have a successful season, so I don't want to risk an injury."
Hansle Parchment, who set a year-leading 12.94 in the 110 hurdles last week in Paris, edged Orlando Ortega in 13.33.
Among the surprises of the meet, worlds runner-up Tony McQuay finished third in the 400, more than a second behind Yousef Masrahi, who won in 44.55. And Cindy Billaud clocked 12.79 to stun worlds bronze medalist Tiffany Porter in the women's 100 hurdles.