Healthy at last, Tyson Gay notched a 100m-200m double in scintillating style at the US athletics championships, but the US veteran knows just how hard it will be to take down Usain Bolt at the World Championships. "It's no secret Usain Bolt is obviously the greatest of all time and he's definitely going to be prepared," Gay said after wrapping up an undefeated trials campaign on Sunday with a world-leading 200m of 19.74sec. That came two days after the 30-year-old posted the fastest 100m of the season in winning the event in 9.75sec. Free of the injuries that slowed him for years in the wake of a three-gold performance at the 2007 world championships.


