The coach of the world's fastest man, Usain Bolt, is confident his charge can go faster.
The Jamaican sprinter burst onto the world stage last year, winning an unprecedented Olympic sprint treble in world record times in Beijing.
His coach Glen Mills says the six foot five sprinter can find even more speed if he sharpens his skills out of the starting blocks.
He says Bolt, who ran 10 sub-10 second performances last season, will get better after he is finished working with him.
But Mills says while he knows the 22-year-old sprint phenomenon can go faster, he is not prepared to pinpoint a set time.