The 2006 World Cup winner was the pre-race favourite and beat her compatriot Gong Jinjie in straight rides to add the sprint crown to the 500m time trial title she won earlier in the week.

Guo won the first three-lap ride in a time of 12.498 seconds, then clocked an even faster time to win the second ride in 11.986 to seize the gold medal.

Racing the final against a fellow Chinese cyclist didn't bother her: "It didn't affect me because we didn't train together or know each other," commented Guo.

Gong took silver, her first major medal. Korea's You Jin A also defeated Hsiao Mei Yu of Chinese Taipei in straight races to win the bronze medal.

Yu's coach Jin Ok Lee wasn't happy with her performance. "I'm not satisfied with today's result. The rider's condition is not good, she has problems with her knee and body. She has such bad pain in the knee. We trained the maximum but it still wasn't enough."

Japan's Tsubasa Kitatsuru took three rides to win the men's sprint gold medal. The Asian champion won the first ride in a time of 11.532 but conceded the second to his opponent Choi Lae Seon of Korea after riding off the track. But 21 year-old Kitatsuru clocked the fastest time of the competition 10.882 to win the title.

"Today was a very tough for me," admitted Kitatsuru. "I had many races and I am tired.

"The second race actually got really dangerous. I went for a strong dash on the inside of the track. In order not to collide with the Korean rider I slightly passed the blue area which is not permitted. It was definitely my mistake and I apologised."

Choi, racing in his first senior season, was philosophical. "The Japanese are very strong riders and I am happy to race with them even if I lose. This year is the first time I have raced at an elite level so I'm very proud . This is my best result."

China's Tang Qi seized the bronze medal by defeating Malaysia's Josiah Ng Onn Lam in two races, clocking times of 11.248 and 11.505.

Asian No 2 Cheung King Wai of Hong Kong, China won the men's points race final with 22 points.

Cheung who can make it double gold if he wins the Madison event on Thursday 14 December, finished four points ahead of Uzbekistan's Vladimir Tuychiev, who finished with 18 points.

Ilaya Chernyshov, who won gold in the men's team time trial, was a further point behind to claim bronze.

"I did exceptionally well. I didn't expect this result," said Cheung. "I was nervous but I could see that I could get a medal. My opponents were not doing too good. I was really serious and wanted to do it."

Silver medallist Tuychiev believes he would have claimed gold if he hadn't sustained a leg injury in training earlier in the year. "When you win then you can be happy. I rode to win and although it is better than nothing without a trauma the gold would be mine. I didn't do anything wrong; it's just my leg."

15th Asian Games, Doha 2006