In May 2004 at an IAAF Grand Prix race in Osaka, Japan, Liu managed to beat Allen Johnson with a personal best record time of 13.06 seconds. He improved even further at the 2004 Athens Olympics. Although he was not considered a favourite for the event, he won the Olympic final by some distance to take the gold medal in a world record-equalling time of 12.91 seconds, matching the feat of Colin Jackson. This was a new Olympic record and was almost three tenths of a second faster than the runner-up Terrence Trammell. The performance had Liu the sixth man to run under 13 seconds for the event and was China's first men's Olympic gold medal in a track and field event. On top of this, it defied the traditional thinking that Asian athletes could not compete in sprint events at the top level. He said that his gold medal "changes the opinion that Asian countries don't get good results in sprint races. I want to prove to all the world that Asians can run very fast."