Triple Olympic and world champion Usain Bolt's stirring anchor leg has led Jamaica to the year's fastest 4x100 metres relay of 37.90 seconds at the Penn Relays in Philadelphia.
Bolt blasted through the final 100 metres in an electronically timed 8.79 seconds, one of the fastest anchor legs ever, as the Jamaicans crushed two American teams to delight thousands of their cheering countrymen in the sold-out stadium.
The world record in the event is 37.10 seconds, set by a Bolt and Asafa Powell-led team at the 2008 Olympics. Powell anchored that team in 8.73 seconds.