Usain Bolt runs 9.77 seconds to win world 100m title in Moscow

Coverage: Live on BBC TV, BBC Radio 5 live, BBC Sport website, mobiles, tablets and Connected TVs. Olympic champion Usain Bolt regained his 100m world title and won a fourth individual World Championships gold with a season's best of 9.77 seconds in Moscow. via Pocket http://www.bbc.co.uk/sport/0/athletics/23658871