Usain Bolt was back to his imperious best, cruising home in his heat in the men's 100 in a relaxed 10.10, as all sprinters ran into a strong headwind....
Bolt's three Jamaican compatriots, Yohan Blake (10.12), Nesta Carter (10.26) and Michael Frater (10.26), all easily won their heats as well, while veteran Kim Collins of St Kitts (10.13) also advanced to the semis, along with Trinidadians Richard Thompson and Keston Bledman, Antiguan Daniel Bailey, Americans Trell Kimmons, Walter Dix and Justin Gatlin, and Frenchmen Christophe Lemaitre and Jimmy Vicault.
Jamaicans Novlene Williams-Mills, Rosemarie Whyte and Shericka Williams all advanced to the semis of the women's 400, along with Americans Allyson Felix, Sanya Richards-Ross and Francena McCorory, as well as Amantle Montsho of Botswana, who motored to an impressive 10.95, but former champ Christine Ohuruogu of Britain false-started and was disqualified.
But it was a great day for Kenyans, who took all the medals in both the women's marathon, which was won by Kiplagat, and the women's 10,000, which ended in a victory for Cheriuyot.