BERLIN -- The IAAF has announced that there were no positive doping cases in the men's 100 meters, the marquee event of the world championships.

Steeplechaser Jamal Chatbi of Morocco is the only positive athlete of the championships so far after more than 600 tests were analyzed.

Usain Bolt won the men's 100 in a world record time of 9.58 seconds, beating Tyson Gay and Asafa Powell.