British trio Adam Gemili, James Dasaolu and Dwain Chambers have all advanced to the semi-finals of the 100 metres.
World junior champion Gemili (10.11) was second behind former world record holder Asafa Powell in his heat.
Dasaolu was third in Usain Bolt's heat in a season's best of 10.13, while Chambers won the final heat in a season's best of 10.02.
Defending champion Bolt stumbled out of the blocks in heat four but was soon into his running and looking around at his competitors, the Jamaican doing just enough to win in 10.09 seconds.
Gemili, 18, only concentrated fully on athletics in January this year but was the fastest man in Britain until Chambers' run in the final heat.
"I was nervous but I just wanted to try and focus and do a good race and execute it properly," he said. "When you walk out in front of a crowd like that it's amazing.
"Having Asafa in the heat was good, he's one of the best athletes of all time so to do quite well against him is good."
Speaking after racing in the lane next to Bolt, Dasaolu added: "He is the quickest guy in the world ever to live; it's just amazing, words can't describe how that felt.
"I think I had a good race, a decent start and I tried to roll along with Usain. He dragged me along from a qualification race into the semi-final, so I'm really pleased with that."