Gay declares himself fit for 100m

Gay trained in Munich before heading to Beijing on Tuesday

World champion Tyson Gay has dismissed any concerns over his fitness as he prepares for the hotly anticipated 100m showdown at the Olympics.

Gay, who turns 26 on Saturday, strained a hamstring at the US trials in July.

But he said in a statement: "When I step on the line in Beijing, don't worry, I'll be ready to go."

World record holder Usain Bolt, fellow Jamaican Asafa Powell and Gay are expected to challenge for the gold medal in the final on 16 August.

Qualifying begins the day before.

American 200m star Wallace Spearmon believes all three sprinters could run under 9.70 seconds.

"I honestly think Bolt can run 9.6 seconds, Asafa can run 9.6 and a healthy Tyson can run 9.6," he said.

"Four athletes ran faster than 9.90 seconds in 2004 but that might be like sixth place here."

Gay, who turns 26 on Saturday, opted out of the US track team's training camp in Dalian in favour of completing his preparations in Munich.

He arrived in Beijing on Tuesday in time to attend Friday's opening ceremony.