China\'s Wu Peng, the man who ended nearly a decade of domination by Michael Phelps in the 200 metres butterfly, said a change in his training regime and a strong season had given him the confidence to aim for a medal at next year\'s London Olympics.Wu\'s good season included two victories over 14-times Olympic champion Phelps, ending the American\'s 60-race winning streak in the 200m which had spanned nine years.A repeat victory over Phelps in London would be difficult, however, Wu told Reuters in a television interview.\"I have to say he has a stronger ability than most of the other swimmers so it is very difficult to beat him again at the Olympic Games,\" Wu said.\"But I still have confidence not just to aim to beat him, but to basically perform at the best of my ability.\"Wu made his Olympic debut at the 2004 Athens Games aged 17, progressing to the final stages of the 200m butterfly. He again missed out on a medal at the Beijing Games in 2008, finishing joint fourth.\"The London Olympics might be the last time I participate in the Olympic Games. For the past two Olympics that I have participated in, I have reached the finals. So I hope to improve on that in London and be amongst the medallists. This is what I am aiming for.\"A native of Hangzhou, Wu said leaving China to train in Michigan in the United States had helped him to improve his performances. The move also eased pressure on the swimmer who had carried China\'s hopes for Olympic success in the pool at the Beijing Games.\"My overall performance has been good this year so that has reaffirmed some of the training that I have had in the United States. After I return to the U.S. next year, I want to work harder on the details and hope for a good performance in the Olympics,\" he said.Looking beyond the 2012 London Games, Wu said he planned to focus more on studying.He said fellow swimmers could learn lessons from Ian Thorpe\'s difficult comback attempt. Australia\'s five-times Olympic champion retired from competitive swimming in 2006 but returned this season with a string of disappointing results, dampening expectations of a fairy-tale comeback ahead of the Olympic Games.\"I feel that it is not easy for him,\" Wu said. \"As age catches up with him and as the sport of swimming develops, I feel it has not been easy for him to make this decision. So he is someone whom a lot of us can learn from.\"