Jamaica's triple Olympic sprint champion Usain Bolt believes he can take the 100 metres world record down to 9.58 seconds and go below 19 seconds in the 200 metres.
Bolt set new marks of 9.69 and 19.30 seconds to win the 100m and 200m titles respectively in August in Beijing, where he was also part of Jamaica's victorious 100m relay team.
The 22-year-old says he's heard his coach Glen Mills talk of 9.58 seconds as a possible time in the 100m and he believes him.
Bolt confirmed that he would probably race 400 metres in the future, but would not be pinned down on when.
He also says he expects renewed competition in the new year from his compatriot and former world record holder Asafa Powell and America's Tyson Gay, who failed to reach the Olympic 100m final.