OSAKA, Japan (AFP) - All-conquering Chinese hurdler Liu Xiang overcame wet and cold conditions here to easily win the men's 110-metre hurdles at the Japan Grand Prix Saturday with the Olympics only three months away.

The 24-year-old Olympic and world champion, who also holds the world record of 12.88 seconds, clocked 13.19 to win in his first outdoor race of the season and sound a warning to the competition ahead of the Beijing Games in August.

Liu led a Chinese one-two finish with Shi Dongpeng, who timed 13.63, second, ahead of Maurice Wignall of Jamaica third in 13.84.

"I like Osaka. I competed in Osaka seven times and I've never been beaten. I want to come back next year again," said Liu.

"Considering that it's rainy and cold, I tried to run solid. Even it was rainy and cold, I clocked 13.19. I'm really satisfied with my race today and I'm happy to win the Grand Prix five times."

After Osaka, Liu is set to compete in the Olympic test event in Beijing on May 22 in the National Stadium and three more races in the United States before the Olympics on home soil.

"I've competed in the Athens Olympics and I'm already the champion. I just try to be positive and try to do 100 percent of what I can do at Beijing," Liu added.

China's Hu Kai and American world bronze medallist Carmelita Jeter wound up the event, the second leg of the 14-round Grand Prix series, by winning the men's and women's sprint races.

Hu timed 10.54 to beat Japan's Shingo Suetsugu into second and Patrick Johnson of Australia into third, with both recording the same 10.55 for a photo finish.

Jeter clocked 11.30 ahead of Chandra Sturrup of Bahamas in 11.53 and Chisato Fukushima of Japan in 11.56.

China successfully won five more titles through Liu Xiaosheng, Huang Xiaoxiao, Li Meiju, Song Aimin and Zhang Wenxiu.

Liu Xiaosheng won the men's 400m in 45.90 beating Sanjay Ayre of Jamaica and Lewis Banda of Zimbabwe, while Huang Xiaoxiao, fifth in the world championships, timed 55.22 to win the women's 400m hurdles.

Li Meiju, ninth at the Athens Olympics threw 18.46m to win the shot put, Song Aimin marked 60.38m to win the discus throw, and Zhang Wenxiu won the hammer throw with a 73.52m mark.

Asian Games gold medallist Kumiko Ikeda of Japan took her second straight and third overall women's long jump title with a record of 6.46m, beating her compatriot Sachiko Masumi and China's Chen Yaling.