Greene with 400m hurdles gold at the 2011 Worlds
There's more than just a gold medal riding on London 2012 for 400 metres hurdler Dai Greene. A place in the history books also awaits.
The Welshman goes into the Olympics as the reigning European, Commonwealth and world champion.
If he adds an Olympic title to his collection, he will become only the fifth British athlete to hold gold medals in all four major events at the same time, following in the footsteps of greats such as Daley Thompson, Linford Christie, Sally Gunnell and Jonathan Edwards.
What is exciting about Greene, who will be 26 when London 2012 gets under way, is that he still has plenty of room for improvement.
In winning the world title in Daegu in 2011 he ran a technically sloppy race, starting slowly and failing to hug the inside line on the bends, but he eventually battled back to overtake Puerto Rico's Javier Culson after the final hurdle.
Greene has vowed to iron out the imperfections he showed that day and should he do so, Culson and the other gold medal suitors will find him difficult to beat.
Greene, who suffers from epilepsy and contracted Osgood-Schlatter Disease in his teens, has shown remarkable determination to reach a point where he stands on the cusp of athletics history.
He previously played for Swansea City football club's youth team before rejecting the opportunity to turn professional. Football's loss was the track's gain, though, as London 2012 is likely to prove once again.
Five Dai Greene facts:
-Greene is an ambassador for charity Young Epilepsy
-Members of the public donated eight tickets to him for his events after he complained on Twitter at only having two per session for his family
-He called out LaShawn Merritt over his drugs ban, saying he would confront him about it on the track, and upset the entire US relay team after labelling them "overrated"
-He said Team GB should not include a football side, insisting there was "no place for it at the Olympics"
-He featured in a safety campaign for Network Rail, making an advert in which he failed to beat an oncoming virtual train across the track