Amantle Montsho of Botswana won the 400 in 50.59 seconds, while Felix crossed in 51.41 to trail fellow American Debbie Dunn by 0.04. Felix is a three-time world champion and a two-time Olympic silver medalist in the 200.

Semenya timed 1 minute, 58.88 seconds to finish 0.59 behind Kenia Sinclair of Jamaica. The South African won the event at the 2009 world championships but was unable to compete for much of last year because of controversial gender testing.

“The time is good. There is nothing bad I can say about the race,” the 20-year-old Semenya said. “It doesn’t matter about the position, it only matters about the time and it’s good to run in the 1:58s.” While trying to regain her form, Semenya has fought injury. But she has made strides in recent months, and was coming off a victory in the 800 at the IAAF World Challenge Dakar Grand Prix before visiting Eugene. Her Pre time was her best this season.

“It was very good,” she said. “It was good to be back.

Fans, I miss that a lot.” The Pre, as it’s known, is the fourth stop on the Diamond League circuit.

Jamaican Steve Mullings won the 100 in a meet record 9.80, the third best time on American soil. Justin Gatlin, who last year came off a four-year suspension for doping, finished sixth in 9.97, his first result under 10 seconds since his return.

Gatlin denies he knowingly used performance-enhancing substances, claiming a massage therapist, Eugene resident Chris Whetstine, used a testosterone-like cream on his legs in the spring of 2006. Whetstine has denied Gatlin’s allegations.

Gatlin, who won the 100 at the Pre in 2005 and 2006, was reinstated last year and has recently been competing in minor meets in Europe. He is still excluded from major European events, and Rajne Soderberg, the director of the Stockholm Diamond League event, said in an e-mail on Friday that the ban still holds.

“It felt good,” Gatlin said of his race Saturday. “I’ve had a quad injury the last week and a half, so been working on that since I’ve been here. But just putting the technique together like my coach said, just come out here and put a good race together.” In the first meeting between American Carmelita Jeter and Jamaican Shelly-Ann Fraser since 2009, Jeter won the 100 in a meet record 10.70, a world best this season. Fraser finished fourth in 10.95. The pair have met 15 times, with Jeter holding an 8-7 advantage.

Walter Dix defended his Pre 200 title in 20.19 seconds. He set the meet record in the event last year running in 19.72.

American David Oliver, the bronze medalist in the 110 hurdles at the 2008 Olympics, won the event in 12.94, besting Liu Xiang of China by 0.06.

Angelo Taylor, two-time Olympic gold medalist in the 400 hurdles, won the 400 in 45.16. South Africa’s Oscar Pistorius, a double amputee known as the Blade Runner, finished last in the field in 46.33. Pistorius needs to run the event in 45.25 to qualify for the worlds in South Korea this summer.

American Bernard Lagat won the rarely contested 2-mile run in 8:13.62, while Ryan Gregson of Australia ran the international mile in 3:53.86. Haron Keitany of Kenya won the elite bowerman mile in 3:49.09.

Abubaker Kaki Khamis won the men’s 800 in a meet record 1:43.68, Kenya’s Ezekiel Kemboi won the men’s steeplechase, and Ukranian triple jumper Olha Saladukha won her event with a leap of 14.98 meters on her 29th birthday.

American Lasinda Demus defended her Pre title in the women’s 400 hurdles in 53.31, best in the world this season.

Ethiopia’s Gelete Burka of the Netherlands won the 1,500.

Nadeshda Ostapchuk of Belarus won the women’s shot put with a throw of 20.59, while Germany’s Robert Harting won the discus with a throw of 68.40. Countryman Raul Spank won the high jump with a leap of 2.32.