SHANGHAI (AP) -- Liu Xiang's hurdles rematch with Jason Richardson is the most anticipated race of the Shanghai Diamond League meet.
Richardson was the surprise winner of the 110-meter hurdles in the world championships in Daegu, South Korea, last August, while Liu was promoted to second after Dayron Robles was disqualified for smacking Liu's hands over the last hurdles.
Liu is the 2004 Olympic gold medalist and last year's champion in Shanghai. He is coming off a victory in his first outdoor race of the season in Japan two weeks ago.
The hurdles field includes Americans David Oliver, the 2008 Olympic bronze medalist; Terrence Trammell, a two-time Olympic silver medalist; and Aries Merritt, who defeated Liu in March to win the world indoor 60-meter hurdles.
Robles, the 2008 Olympic champion, wasn't entered.