London 2012 Olympics: Adam Gemili cruises through to World Junior Championships semi-final Britain's other 100m representative Chijindu Ujah also progressed safely into Wednesday's semi-finals, finishing second behind Ernest with a time of 10.48sec. Speaking after his run, Gemili said: "Today I didn't give my best because I wanted to reserve it for tomorrow's race. I hope to make it great tomorrow. A professional footballer until he devoted himself full-time to athletics in January, Gemili burst onto the national and international scene when he ran a huge personal best of 10.08sec in a low-key race in Germany on June 2. That time made him the No 1-ranked junior and, despite losing to Dwain Chambers in the UK Olympic trials, Gemili's amazing rise to the top will see him line up alongside the likes of Usain Bolt and Tyson Gay at London 2012. Earlier in the day Britain's Jessica Judd and Emily Dudgeon won their heats in the women's 800m, while James Gladman took victory in his 110m hurdles heat to all book their places in Wednesday's semi-finals.