Justin Gatlin celebrates after winning the men's 100 meters event at the IAAF Diamond League meeting in Lausanne, Switzerland on Thursday Photo: IC

American Justin Gatlin has Usain Bolt fixed in his sights and has expressed his hope that the injured Jamaican sprint king will be healthy for next month's World Championships.

Gatlin, at the age of 33, will head to the Beijing worlds as firm favorite in both the 100 and 200 meters, another victory in 9.75 seconds in the shorter event on Thursday extending his unbeaten streak to 26 races since August 2013.

The American courts controversy wherever he goes given his background. He won the 2004 ­Olympic 100 meters title and was 2005 world sprint double gold medalist but then served a second ­doping ban from 2006 to 2010 before returning to nail the 2012 world 60 meters indoor title, Olympic bronze at the London Olympic Games and a world silver in Moscow a year later.

But Gatlin shuns any talk of his distractions, saying he has served his time on the sidelines after a mistake and is now clean.

He instead concentrates on the mouth-watering thought of usurping Bolt, who has dominated sprinting at the Olympic Games and World Championships since his golden treble at the 2008 Beijing Games - bar one hiccup over 100 meters in the 2011 Daegu worlds.

"Hopefully Usain will be healthy and ready to go when the World Championships come around and hopefully I'll see him in the finals," Gatlin said after his victory at the Diamond League meet in Lausanne.

The American, however, said Bolt would not be worrying about the form of a raft of sprinters currently racing while he undergoes treatment on a pelvic injury.

"Usain's a great opponent, for one, and two I don't think that he has to worry about anybody, he has to go out there and do what he does, and what he does best is go out there and win championships. So it's on me to go out there and give him the best challenge possible."

Of the current crop of sprinters, old heads are predominant, and in Lausanne it was two other 33-year-olds close on Gatlin's heels in the shape of Jamaican Asafa Powell and American Tyson Gay, who both clocked 9.92 seconds.

"I don't think it's about beating somebody, it's about beating everybody," Gatlin said when asked if he visualized trumping particular ­opponents. "There's going to be six other guys besides myself and Usain on the line jockeying for position."

Bolt will compete at the London Anniversary Games later this month, the six-time Olympic champion confirmed on Friday.

"London is a special place where I love to compete and I am looking forward to the Anniversary Games," Bolt said in a statement.

"I have great memories of competing in the Olympic Stadium in the summer of 2012 and in the previous Grand Prix meets in London."

The London Anniversary Games take place at the Olympic Stadium from July 24 to 26.