Sport James Dasaolu last year ran the second-fastest 100m time by a British sprinter ever

As James Dasaolu settles in the blocks for his first race of the season in Glasgow on Saturday there will be a sense of expectation and apprehension over whether he can back up his breakthrough year.

Tyson Gay celebrates after winning the Men's 100 m event during the Diamond League Athletics meeting

Steroid found in sample of banned US sprinter Tyson Gay

Details emerge of substance that led to ban

Asafa Powell has blamed his failed test on a supplement

Robin Scott-Elliot: Athletics risks being dragged down by lack of speedy action over Jamaica's drugs scandal

It is the question every athlete or cyclist who achieves something out of the ordinary will be asked for now and probably ever more: Are you clean? Did you run the 100m at lightning speed without illegal aid? Did you scale that mountain dancing on your pedals without an unnatural high?

The Great Britain 4x100m relay team of (left to right) Adam Gemili, Harry Aikines-Aryeetey, James Ellington, and Dwain Chambers celebrate their bronze - but they were soon notified of their illegal changeover
Usain Bolt (second from right), celebrates with Jamaican 4x100m team-mates (left to right) Nickel Ashmeade, Kemar Bailey-Cole, and Nesta Carter
Tiffany Porter, left

World Championships: Christine Ohuruogu sets example as medals keep coming

Following on from Mo Farah's flying finish in the 5,000m final on Friday, the British medals kept coming in the home straight of the Luzhniki Stadium on the penultimate day of the track and field World Championships. First Christine Ohuruogu, winner of the individual 400m crown on Monday, anchored the women's 4 x 400m relay team to bronze. Then Tiffany Porter – the 100m hurdler from Michigan with the British parents and the UK passport – took bronze in her final.

Great Britain's Adam Gemili after his 200metre final on seven of the 2013

World Championship: Adam Gemili quickly making up ground after career change

And to think… instead of settling into his starting blocks next to Usain Bolt in the World Championship 200m final yesterday, Adam Gemili might have been lining up for Dagenham and Redbridge at Glanford Park, home of Scunthorpe United.

Speed merchants: Breaking free in the World Club Sevens at Twickenham

World Club Sevens: Short circuit can electrify club funds

Marketing men rub their hands as Sevens format quickly gains ground around the world

Usain Bolt, centre, leads the field, including Adam Gemili, left, in his 200m victory in Moscow

World Championships: Usain Bolt triumphs again in league of his own

Jamaican secures his seventh world gold by defending 200m title with ease, while Briton Gemili narrowly misses out on medal

Mo Farah stretches away to take 5,000m gold in Moscow last night

World Championships 2013: Feel-good Friday for Mo Farah as British superstar completes incredible 'double double'

The best efforts of Africa’s finest cannot deny the superstar of distance running his double double glory on the Moscow track

Adam Gemili
Perri Shakes-Drayton struggled with her left knee during yesterday’s 400m hurdles final

World Championships 2013: The dream dies as Perri Shakes-Drayton limps over the line in Moscow

British medal prospect injures knee on first bend to end hopes of challenging Zuzana Hejnova

Conrad Williams of Great Britain hands over to Michael Bingham

World Championships 2013: Great Britain cruise into 4x400 metres relay final

Conrad Williams, Michael Bingham, Jamie Bowie and Martyn Rooney finished second in the semi-final

Jessica Judd at the end of her race

World Championships 2013: Jessica Judd admits 800m performance was 'a disaster' after exit in Moscow

Marilyn Okoro and Laura Muir progress but youngster fails on the big stage

Mo Farah competes in the 5,000 metres heats

World Championships 2013: Mo Farah does just enough to reach 5,000 metres final

The Briton exerts as little energy as possible in heat

Amantle Montsho of Botswana

World Championships 2013: Christine Ohuruogu finally breaks 400m record she targeted for a decade

The Briton won an extraordinary race by 0.004 seconds

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