Usain Bolt's labelled his first race of 2016 rusty.

The six-time Olympic champion grimaced after he crossed the 100 metre finish line in 10.05 seconds at the Cayman Invitational.

It's the third slowest time of his career as the Jamaican looks to claim an unprecedented three-peat at the Rio Games this year.

Bolt hasn't raced since August last year, dealing with an ankle injury in the offseason and told reporters he was aiming to clock 9.91 seconds.