Usain Bolt wins 100-meter title at world championships in 9.79 seconds Author:SI StaffPublish date:Aug 23, 2015BEIJING (AP) Usain Bolt wins 100-meter title at world championships in 9.79 seconds.Latest NewsChelsea wastes 2-goal lead in draw with Sheffield UnitedLaporte injury mars Man City's win over BrightonKvitova makes quick work of Bencic, eases into Round of 16Mayakoba Golf Classic: Preview, tee times, odds, picksRaiders in discussions to trade Amari Cooper, Karl Joseph