Athletics: Bolt trumps Gatlin to retain world 100m title

Jamaica's Usain Bolt (2nd R) celebrates before (L-R) USA's Justin Gatlin, USA's Tyson Gay and USA's Mike Rodgers as he wins the final of the men's 100 metres athletics event at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing on August 23, 2015. AFP PHOTO

Jamaican Usain Bolt trumped American rival Justin Gatlin to retain his world 100m title in spectacular style on Sunday.

Bolt, also the double Olympic gold medallist and world record holder in the blue riband event, ran a season's best of 9.79 seconds in Beijing.