Yesterday, all four 100m sprinters cruised through the first round, Odean Skeen and Jazeel Murphy in the morning session winning their heats, while Monique Spencer and Shawnette Lewin did likewise in the afternoon session.

Youth Olympic champion and National Junior Trials champion Skeen clocked 10.50 seconds to beat Japan's Kazuki Kanamori, who ran a PR 10.57, and Fana Mofokeng of South Africa, 10.59. Skeen said he was "happy with the time" and felt comfortable and relaxed throughout.

Murphy, who was running for the first time ever in July, was all smiles after winning his heat in 10.45. He admitted staying back at the gun. "I did not want to false start," he said, but he did not have to use up too much energy in beating Patrick Domogala of Germany (10.56) and Ben Jaworski of Australia (10.65). Murphy will run in the first semi-final today against American Tyreek Hill, who has a season and PR 10.19, while Skeen runs in the third semis, where his biggest competition should be another American, Aaron Ernest.

The top two from each semis and the next two fastest will advance to the final at 9:45 pm (2:45, Jamaica time).