Fraser was quickest out of the blocks and led all the way, crossing the finish line in 10.91 seconds. Jamaica's defending World champion Veronica Campbell-Brown did not recover from a slow start and was third in 11.03. Debbie Ferguson-McKenzie of the Bahamas was second in her season's best of 10.97.
"When you get under 11 seconds it's always good," Fraser said. "I'm just happy that I came out here and won against a quality field."
L.J. van Zyl of South Africa and Lashinda Demus of the United States set world-best times this year in the 400-metre hurdles.Van Zyl's late burst over the final 10 metres took him past Bershawn Jackson - the 2005 world champion and Olympic bronze medallist last year in Beijing - who looked to be coasting to victory.
Van Zyl won in 47.94 seconds, beating Jackson's mark of 48.03 set at the US Championships last month.
Season's best
Three days after breaking her own 2009 world-best time (53.65) at the Crystal Palace meet, Demus improved with 52.63. Demus had also set a season's best when she ran 53.78 last month at the US Championships.
Maggie Vessey of the United States also set a world-best time for 2009 in the women's 800.
Vessey even surprised herself by clocking 1 minute, 57.84 seconds to beat Russian Anna Alminova's mark of 1:57.86 set in Cheboksary, Russia, only five days ago.
Feels good
"I'm usually last, being up there with everyone is really racing," Vessey told French television after her win in warm temperatures at Stade Louis II.
Vessey's win was even more unexpected considering she ran 2:00.13 at the Golden Gala in Rome just over two weeks ago, and only 2:01.32 at the US Championships last month.
Less than three weeks ahead of the world championships in Berlin, Croatian high jumper Blanca Vlasic narrowly beat Germany's Ariane Friedrich. Both passed 2.03 metres, but Vlasic did so at the second attempt, while Friedrich did so on her third go. Both then failed to pass 2.05.
Vlasic, the Olympic silver medallist in Beijing, could find it harder when she takes on Friedrich in front of her own fans at the worlds, yet seems to be relishing the challenge.
"I hope they will also have some energy to cheer for me," Vlasic said. "I'm not worried about that, I have lots of fans in Germany."
Elsewhere, Olympic champion LaShawn Merritt of the United States won the men's 400, despite a difficult start.
LOOKING AHEAD
"I was a little bit restricted at the start," said Merritt, who was looking ahead to getting a gold medal in Berlin.
"In 2007 I came second, I don't have a world title under my belt," said Merritt, who got a silver in the 400 two years ago in Osaka, Japan. "I want that world title."
World record-holder and Olympic champion Dayron Robles of Cuba won the 110 hurdles, but accepts he still needs some improvement before Berlin.
"All I have to do is keep working hard and things will happen," Robles said.
- AP