RALEIGH, North Carolina - Olympic double bronze medalist Walter Dix does not buy the talk that America, without Tyson Gay, will have no answer for Jamaica's Usain Bolt and Asafa Powell at next month's World Championships.

US championship victories at 100 and 200m have convinced the Floridian he can be a shock factor in the short race and medal in the longer run at the Aug 27-Sept 4 World Championships in South Korea.

"I love to prove people wrong," Dix, who will compete in Canada's National Track League meet in Toronto on Wednesday, said.