In the women's 100m the USA's Carmelita Jeter stormed to victory in 11.00 seconds, leading home Jamaican duo Veronica Campbell-Brown and Sherone Simpson.
Elsewhere at the Daegu Stadium there were some surprise results in the newly-formed IAAF world challenge, part of a series of 13 one-day invitational meetings.
In the men's 110m hurdles Olympic champion Dayron Robles was caught cold by the USA's David Oliver.
It was Robles's first race of the season, but he was well beaten by the American who put in a joint season's best time of 13.11 seconds.
USA's Virginia Powell triumphed in the women's 100m hurdles, edging out world indoor champion Lolo Jones and Canada's former world champion Perdita Felicien.
Just 0.03 seconds separated the top three in a thrilling finish, as Jones hit the final hurdle.
In a tightly-fought men's 200m USA youngster Ryan Bailey, 21, pipped Jamaica's Marvin Anderson by 0.01 seconds to seal a surprise win.
Double Olympic 400m champion Angelo Taylor cruised to victory in the men's one lap event, the American was unfazed as he powered home in golden spikes and sunglasses in a time of 45.21 seconds.
Jamaica's Kenia Sinclair coasted to victory in the women's 800m, with the USA's Bianca Knight winning the 200m.
In the 800m there were wins for South African world champion Mbulaeni Mulaudzi in the men's race, and a commanding victory for Jamaica's Kenia Sinclair in the women's event.
Daegu Stadium is the venue for the 2011 IAAF World Championships 2011, so while the focus is on the Diamond League, some athletes are taking the opportunity on their way to South Korea to test the championship track ahead of next year's big event.
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