Usain Bolt says he is not yet ready for a duel with Justin Gatlin but is looking forward to silencing the confident American in a Beijing sprint “explosion” at the World Championships in August. While the Jamaican has eased into the season after an injury-disrupted 2014, Gatlin has set the fastest times of the year in both sprints and declared himself the “man to beat”. “Gatlin has been doing a lot of talking, saying a lot of things,” Bolt said ahead of Saturday’s Diamond League meeting in New York. “He’s proved he’s running fast times and he’s ready. So it should be exciting going into the World Championship. “I look forward to competing when people talk because if you don’t back it up you look really stupid.”