Usain Bolt, 25, Jamaica, 100m, 200m, 4x10o
The main man of athletics has been riding a wave of success since his breath taking performance at Beijing 2008. That was until being disqualified from the 100m final of the World Championships last year. More recently Bolt has faced increasing competition from his training partner and fellow Jamaican, Yohan Blake, who beat him at this years Jamaican trials. Success at this summers Olympics will enhance his already glowing reputation as the greatest sprinter the world has seen.
Tom Daley, 17, Great Britain, Diving
The teenage sensation is set to make a huge splash at his home Olympics. Daley became the youngest competitor to participate in a final when he represented Britain at the 2008 Olympics. A year later he won the 2009 FINA World Championship and at 15 he won two gold medals at the 2010 Commonwealth Games.
Jessica Ennis, 26, Great Britain, Heptathlon
Every Olympic game creates a poster girl and Jessica Ennis is set to be crowned Miss London 2012 if she scoops gold in the heptathlon. Sheffield-born Ennis has been in fine form this season but pressure from an expecting nation will weigh heavily on her shoulders. Snapped up to be the face of many products pre-Olympics her life may be turned upside down if she finishes the games with a gold around her neck.
Michael Phelps, 26, USA, Swimmer
He is the greatest swimmer to ever enter the pool and holds the record of most Olympic Golds with 14 to his name. With London set to be Phelps’ last port of call before retirement, the record breaker is still hungry for more. Competing in seven events at this summers games, Phelps needs three medals to break yet another record- the most medals ever won by an individual, which is currently set at 18 by gymnast Larisa Latynina (Phelps won two bronze medals at Athens 2004).
Liu Xiang, 29, China, 110m hurdles
Having been forced to pull out of his home Olympics in 2008, Chinese Xiang will be looking to win his second gold following success at the 2004 games. Since his injury in 2008, Xiang has struggled to get back to top form but he has shown signs of reaching his world beating best this year.