David Rudisha, the World and Olympic 800m Olympic champion who opens his IAAF Diamond League campaign in Doha on Friday, could be forgiven for lacking a little motivation this season after his stupendous World record performance at London 2012.

A stellar field of Olympic and World champions has gathered in Doha to set the 2013 IAAF Diamond League off and running, and spectators at the Hamad Bin Suhaim Stadium will witness a series of compelling head-to-heads.

Just five weeks after running half the race at the London marathon Mo Farah is returning to the English capital - this time to defend a title.

Olympic champion and World record-holder Usain Bolt opened his 2013 campaign with 10.09 while World champion Carmelita Jeter sped to a world-leading 10.95 in the 100m at the Cayman Invitational Wednesday night (8).

It is early season, which means for some the gradual climb towards hitting the peak at the right time. One athlete is a prime example - French triple jumper Teddy Tamgho.

Olympic champion Sally Pearson was the star attraction in Chonburi, Thailand, on Wednesday (8) as she ran in the 4x100m Relay for Australia in the second leg of the Asian Grand Prix series at the IPE Chonburi Campus.