Travis Padgett and Allyson Felix of the United States won the men's 100 meters and women's 400 at the Qatar Super Grand Prix on Friday.
Padgett equaled the year's best time of 10 seconds, pushing Jamaica's Michael Frater to second in 10.15 and Britain's Marlon Devonish to third.
"I came here to win and I think I did pretty well out there," Padgett said. "It was good competition, not an easy race. I was running on a fast track so that helped."
Felix easily won her first individual race of the season with a time of 50.75 seconds.
For the 200 silver medalist at the Beijing Olympics, it was her seventh win in five appearances in Doha.
"I think I am getting in shape (for the season ahead) very nicely. It is not a great time, but it was my first (individual) race of the season," Felix said.
Jamaica's Kerron Stewart won the women's 100 in 10.93, a meet record at Qatar Sports Club Stadium.
American Stephanie Durst was second in 11.15 and Jamaica's Sheri-Ann Brooks third.
"I felt really good after the first 40 meters," Stewart said. "I kept my composure and finished strong. I am definitely happy. I am a perfectionist so I will try to improve in my next races. I think I have to work on the first 30 meters."
American sprinter David Oliver won the men's 110 hurdles in 13.09, the year's best time. Antwon Hicks of the United States was second with 13.24, and Andrew Turner of Britain third at 13.31.
Another best time of the year was set in the 800, won by Abubaker Kaki Khamis of Sudan in 1 minute, 43:09 seconds, also a meet record.
Canada's Priscilla Lopes-Schleip won the women's 100 hurdles in 12.52, another meet record and year's best time.
"All the girls were quite fast," Lopes-Schleip said. "But I think I did a good job, getting good time."
In the women's high jump, Blanka Vlasic of Croatia won with 6 feet, 8 3/4 inches, a meet record.