The Jamaican triple Olympic champion Usain Bolt won't be able to repeat his world record performances of 2008 and 2009 at the London Olympics, predicts former world record holder Maurice Greene.
Greene believes the 100 metres in London will be much closer than many people believe.
Bolt set world records in the 100 and 200 metres and the 4x100 metres relay at Beijing Olympics.
He then bettered both the 100 and 200 times at the Berlin world champs in 2009.
Greene, who won the 100 gold medal at the 2000 Sydney Olympics says Bolt isn't in the type of form he was in 2008 and is having problems with his start, which he still hasn't resolved.