Sprinter Usain Bolt had to work hard for his 100-meter victory in 9.90 seconds at the Weltklasse Diamond League meet in Zurich on Thursday. Bolt had the slowest reaction time out of the blocks. Fellow Jamaican Nickel Ashmeade, running two lanes to his left, led deep into the race. But the world and Olympic champion gritted his teeth and muscled through the slight headwind to reach the front after 85 meters. Ashmeade finished in 9.94 seconds for second place and world silver medalist Justin Gatlin of the United States was third in 9.96. Bolt put on a typical pre-race act for the crowd, pressing his hands together as if in prayer before breaking into karate-style moves.