DOHA, Sept. 29 -- Liang Rui led a one-two finish for China in the women's 50km race walk event that concluded here on Sunday, while American sprinter Christian Coleman stormed to a personal best and world leading time to win the men's 100m title at the 2019 athletics world championships.

Wearing a towel with ice wrapped in around her neck, the 25-year-old Liang enjoyed a comfortable lead after 25km of the race and clinched the victory in four hours, 23 minutes, 26 seconds.

"The weather conditions of the race were very, very tough because of the temperature and humidity. Before the race I was worried that I might collapse halfway. So my goal was to finish the race first and then try to win a medal," Liang said.

Her teammate Li Maocuo took the silver medal in 4:26:40 and Eleonora Anna Giorgi of Italy finished third with a clocking of 4:29:13.

Team USA turned out to be the biggest winners on the second competition day of the biyearly track and field gala as they not only grabbed two gold medals but also set a world record in 4X400 mixed relay heats.

Coleman clocked a world leading time of 9.76 seconds in the blue ribbon event, trimming 0.03 seconds off his personal best achieved 13 months ago. His American compatriot and defending champion Justin Gatlin took silver in 9.89. Andre De Grasse of Canada was third in 9.90.

"I've been blessed with incredible talent and tonight I was able to show it. I have been working incredibly hard and this just makes it all worthwhile," the 23-year-old Coleman said.

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