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Su Bingtian competes in the men's 100-meter race during the 2018 Prefontaine Classic on Saturday in Eugene, Oregon. It was the third stop of the IAAF Diamond League. [Photo/Agencies]　

Chinese sprint megastar Su Bingtian once again showed the world he is the quickest in China as he got another wind-assisted sub-10-second 100-meter run.

Su, the first Asia-born sprinter to run 100 meters in under 10 seconds, took fourth place in the men's 100 with a wind-assisted 9.90 seconds at the third stop of the IAAF Diamond League on Saturday in Eugene, Oregon, in the United States.

US runner Ronnie Baker won the championship in a wind-assisted 9.78 seconds.

Su's previous personal best, 9.99 seconds, was China's national record, which he claimed in 2015 at the IAAF World Championships in Athletics in Beijing.

After Su, 29, took the silver in 10.05 seconds at the Shanghai Diamond League, the second stop of the IAAF's prestigious global circuit, Su said that he was ready to regain his record.

"It is just a start," he said after the Shanghai race. "I hope I can be better and better in the future. I have told my coach that I wanted to showcase my best form in Eugene, even just a little progress."

Although the 9.90 seconds is a wind-assisted record (+2.4m/s), Su has shown his momentum this year. He headed into the meet bolstered by a great start to the year when he claimed the overall 60-meter title on the IAAF World Indoor Tour－a victory that gave him the confidence that he is still a force to be reckoned with.

"I told my wife last year I might call it quits this season, but I found I still have dreams to achieve.... Now I tell myself to keep training and, hopefully, I can compete again at the 2020 Olympics in Tokyo," said Su earlier this year.