Bolt leads Jamaica to 4x100 world record

In one whirlwind week, Usain Bolt turned the biggest disappointment of his career into another golden show capped with a world record that even he long believed was not within him this year.After opening with a false start in 100 final last Sunday, Usain Bolt again produced the amazing in his closing race of the world championships anchoring Jamaica to a world record in the 4x100-metre relay.When the first three runners passed the baton, Bolt suddenly saw the unexpected become reality.One day after winning gold in the 200, Bolt was devastating down the home stretch of the relay and threw his yellow-clad chest across the line for a time of 37.04 seconds the only world record in nine days of competition.Fittingly, Jamaicas yellow-green-and-black flag was the last one rising into the night over Daegu Stadium, and Bolt spread his giant arms wide to soak in the occasion with all his might.The United States was out of it because of a botched exchange, but no one could have gotten close to a Jamaican team anchored by Bolt.On a final day of seven finals, one silver medal also stood out.Caster Semenya failed to defend her 800 title, faltering late down the finishing straight to allow Mariya Savinova of Russia get the gold. Silver, however, was better than many expected as the South African showed glimpses of her powerful running that made her the dominating athlete over the distance two years ago, before a gender controversy sidelined her for a year.Allyson Felix added another gold to bring her collection of titles to a womens record eight over four championships. The American ran the second leg of the winning 4x100 relay, one day after getting gold in the 4x400, too.With Christian Taylor winning the triple jump, it left the United States at the top of medal standings with 12 gold and 25 overall.Tatyana Lysenko won the womens hammer throw, putting Russia in second place of the standings with nine gold and 19 medals overall.Britain got some good news ahead of next years London Olympics, with Mo Farah holding off Bernard Lagat of the United States to win the mens 5,000. Farah also won silver in the 10,000 last weekend.