Powell quickest in Shanghai

Asafa Powell has joined 100m sprint rival Usain Bolt in admitting a touch of nerves before they meet in a Diamond League showdown in Rome on Thursday.

The meet will be the Diamond League debut for both Jamaicans.

"Every sprinter, when they're going to run their first competition, is a bit nervous seeing where they're at, or if they forget how to run," said Powell.

"I'm just going out to give my best, just go all out and see what the results will be."

Powell set the 100m world record with a time of 9.74 seconds in Rieti, Italy, in 2007 before Bolt took the 100m event by storm, breaking the mark three times.