By MICHAEL CASEY AP Sports Writer DOHA, Qatar (AP) -- David Rudisha, the 800 meters world champion and Olympic favourite, likes his chances if he faced Usain Bolt in the right race. At a press conference Wednesday for the season-opening Diamond League meet, Rudisha considered the possibility of facing Bolt in a showdown he'd love but can't see happening. The Kenyan picked the 4x400-meter relay for the dream clash with Bolt, in that they would meet at a distance between their best races. "I would come down to 400 and he is doing 100 and 200 so doing 400 we would meet in the middle," Rudisha, who has run 400 races in the past to improve his speed. "Usain Bolt is fast. I don't have that speed. I have that little bit of speed and mileage. That's why I say it would be fun and enjoyable to watch. "It would be an interesting race if we were doing the last leg together. It would be great seeing two world record-holders competing." Rudisha, who comes into Doha injury-free, said the race Friday will help him gauge his buildup for the London Games. Winning gold is the one major achievement that has eluded the 23-year-old world champion. A world-best time in Doha would show he is on track, he said. "This is an Olympic year and that is my main focus," Rudisha said. "I'm desperate to win the Olympics. This is what I am so far missing in everything I've done." Rudisha is the clear favourite in Doha, especially after his rival Mohammed Aman pulled out. The 18-year-old Ethiopian beat Rudisha in Milan in September and won the 800 at the world indoor championships in March. "He's good and talented," Rudisha said, comparing the rivalry with Aman to his early competition with Abubaker Kaki of Sudan, who is running the 1,500 in Doha. "It's good to get that challenge because it give us good competition, which is healthy for us ... I know if I don't work hard, then he will be ready to beat me." With two world record-breaking runs in 2010 and the world championship last year, Rudisha acknowledges his popularity has skyrocketed. But he said he has no plans to change his training regiment. "Everything changes especially when you do something special. You see people approach you and the respect they give you because you did something special," Rudisha said. "When it comes to training and when it comes to your focus, you don't have to change. It's good to be humble and do what you have been doing." Gatlin back after 4-year doping ban DOHA, Qatar (AP) -- For Justin Gatlin, Doha will always be the place he made history -- even if his record is no longer in the books. The American tied Asafa Powell's then-world record in the 100 meters by running 9.77 seconds in May, 2006. It was initially clocked at 9.76 before a timing error was discovered four days later. However, the revised time was erased after he tested positive for excessive levels of testosterone two months later. Now 30, Gatlin doesn't want to dwell on the four-year ban that followed, instead preferring to remember a "magical night." The 2004 Olympic gold medallist will race against Powell and Nesta Carter at the season-opening Diamond League meet on Friday. "It's a very special place for me," Gatlin said Wednesday. "The night that I broke the world record was a magical night. Running the first round and basically equaling my PR, and coming back and knowing the second round could be faster with a better effort. I could see history being made on the track before long. Hopefully, coming into the race in a couple of days, I can do the same thing." Much has changed since he returned to the track in July 2010, with Usain Bolt winning the 100 title among three Olympic gold medals and smashing the world record in a blistering 9.58 seconds.