Tyson is to have surgery on his groin in the close season
American Tyson Gay beat Asafa Powell for the second time in a week to win the 100m at the Daegu International.
Gay, who equalled the second fastest 100m time with 9.69 seconds on Sunday, clocked 9.94 in South Korea, with Powell timed at 10 seconds exactly.
Britain's Jeffrey Lawal Balogun ran 20.98 in the men's 200m but was beaten by American Wallace Spearman's 20.29.
In the women's 800m GB's Jenny Meadows triumphed in two minutes 01.65, pushing Sonja Roman into second place.
It was Gay's third race in less than a week, after he appeared in Japan's Super Track and Field meet and ran 10.13 seconds.
The improved time was his 21st sub-10 second run, and it took his winning ratio against Powell to 6-1.
Also in Daegu, venue for the 2011 World Championships, Carmelita Jeter of the United States won the women's 100m in 10.83 seconds.
And Russian pole vaulter Yelena Isinbayeva won the pole vault in 4.60 metres, but then failed to clear 4.85m, some way short of her world record of 5.06m.