American sprinter Tyson Gay's run the fastest 100 metres time this season, with a 9.75 second dash to win the US national championships in Iowa.
It's the 10th fastest time ever in the 100 metres - Gay's best time is 9.69, set three years ago, which is the equal third best ever, alongside record holder Usain Bolt, and his Jamaican team-mate Yohan Blake.
Bolt of course holds the outright record of 9.58, as well as the second fastest ever time of 9.63.
