Grimacing Bolt on his knees after win

Usain Bolt (left) eased to victory in Ostrava last night (Reuters)

Usain Bolt eased to victory in Ostrava last night, but his post-race reaction was somewhat unusual.

The fastest man of all-time got off to a poor start in the 100m, but sharpened up over the closing 30m, recording a time of 10.04 seconds.

He grimaced a stride out from the line, though, and went to his knees after finishing, removing his shoes instantly and walking away less than comfortably.

It was a poor night for Great Britain's Dwain Chambers. He was a distant fifth in 10.28 – missing both the A and B Olympic qualification marks.