Please read the following text and summarize it. The final output should be limited to 50 words. Here is the text: NAME_1 aims to wipe out the pain of losing his Olympic 100m title in Athens by winning a fourth World Championship crown this summer.He had to settle for bronze in Greece behind fellow American NAME_2 and NAME_3 of Portugal. 'It really hurts to look at that medal. It was my mistake. I lost because of the things I did,' said NAME_4, who races in Birmingham on Friday. 'It's never going to happen again. My goal - I'm going to win the worlds.' NAME_4 crossed the line just 0.02 seconds behind NAME_5, who won in 9.87 seconds in one of the closest and fastest sprints of all time. But NAME_4 believes he lost the race and his title in the semi-finals. 'In my semi-final race, I should have won the race but I was conserving energy. 'That's when NAME_3 came up and I took third because I didn't know he was there. 'I believe that's what put me in lane seven in the final and, while I was in lane seven, I couldn't feel anything in the race.'I just felt like I was running all alone. 'I believe if I was in the middle of the race I would have been able to react to people that came ahead of me.' NAME_4 was also denied Olympic gold in the 4x100m men's relay when he could not catch Britain's Mark NAME_6 on the final leg. The Kansas star is set to go head-to-head with NAME_6 again at Friday's Norwich Union Grand Prix. The pair contest the 60m, the distance over which NAME_4 currently holds the world record of 6.39 seconds. He then has another indoor meeting in France before resuming training for the outdoor season and the task of recapturing his world title in Helsinki in August. NAME_4 believes NAME_5 will again prove the biggest threat to his ambitions in Finland. But he also admits he faces more than one rival for the world crown. 'There's always someone else coming. I think when I was coming up I would say there was me and NAME_7 (NAME_8) in the young crowd,' NAME_4 said. 'Now you've got about five or six young guys coming up at the same time.' Give two different versions of responses. Please separate the responses with 6 asterisk symbols: ******.
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