Carl Lewis beat world champion Ben Johnson, 10.05 seconds to 10.35, but it was in separate 100-meter races at the Rieti (Italy) meet.
Johnson refused to race with Lewis, saying he was too tired and did not want tough competition. Lewis said he was disappointed at Johnson's decision.
In the recent world championships in Rome, Johnson ran a world record 9.83 in beating Lewis.
In Rieti, Lewis' strong effort beat Ray Stewart of Jamaica, who was second in 10.27. Johnson coasted, clearly slowing down as he edged Harvey Glance's time of 10.41.
The meet featured many stars of the world championships, but most appeared tired and not at their best.
The exception was Bulgarian high jumper Steska Kostidonova, who made a try at the world record of 6 feet 10 1/4 inches and just missed. She won the competition at 6-9.
Said Aouita of Morocco won a good men's 1,500 meters in 3:32.71, three seconds off his world record. Peter Elliott of Britain was second at 3:33.23 and New Zealand's John Walker third in 3:34.75.
The United States' Earl Bell won the pole vault at 18-8 1/4 as Sergei Bubka of the Soviet Union, the world champion and record holder, failed to clear his opening height of 18-4 1/2.
Christo Markov of Bulgaria once again beat Mike Conley of the United States in the triple jump. Markov carried 57-6 1/2 to Conley's 57-4 3/4.
The women's 100 also went in heats, Alice Brown (U.S.) winning hers in 11.22 seconds and Angella Issajenko (Canada) taking the other in 11.21.
Other winners: Mark McKoy of Canada, 13.59 seconds in the 110-meter hurdles; Larry Myricks (U.S.), 27-3 3/4 in the men's long jump; Sydney Maree (U.S.), 13:22.43 in the men's 5,000, and Igor Paklin (U.S.S.R.), 7-7 1/4 in the men's high jump.