Tyson Gay again had too much power for Asafa Powell as he beat him over 100 metres in the Daegu International in South Korea.

Gay coasted to his 21st sub-10 second performance when he repeated his victory in Shanghai last Sunday with a time of 9.94seconds.

The American established a 6-1 winning ratio ahead of Powell, the former world record holder, who clocked 10.00secs.

Carmelita Jeter, unbeaten since finishing third at the World Championships in Berlin last month, won the women's 100m in 10.83.