Usain Bolt has laughed off allegations that he is scared to face Justin Gatlin, the fastest man of 2015.
Gatlin has clocked the fastest times this season in both the 100m and 200m, and is set to meet Bolt for the first time this year along with Tyson Gay and Asafa Powell in the Beijing World Championships in August.
"Afraid? When people say that, I laugh," said Bolt. "I've been in the sport for years and I've never dodged anybody. When it matters, I've always showed up and shown that I'm the best.
"Gatlin has been doing a lot of talking, saying a lot of things. He's proved he's running fast times and he's ready. So it should be exciting going into the World Championships.
"I look forward to competing when people talk... because if you don't back it you look really stupid."
Bolt, who holds the world records for the 100m and 200m, was disqualified from the 100m final in the 2011 World Championships after a false start, but did win the 200m.
But he failed to break the 20 second barrier in his first race in Europe this year, when he won the Golden Spike in Ostrava in May.
"I'm not in the best shape and I'm not going to put myself out there if I know I'm just coming back. When I get to Beijing I'll be ready to go and that's when the showdown will be."