US sprinter Tyson Gay overcame a false start to steam to victory in the 100m at the season's final Diamond League meet here on Friday, but Caster Semenya failed in her bid to win the women's 800m.

In a season which has seen Jamaican duo Usain Bolt and Asafa Powell sidelined through injury, Gay settled his nerves after a starter's error to clock 9.79sec to be crowned the season's top performer in the event, netting 40,000 dollars.