Gold medalist Zhang Yining (C), silver medalist Wang Nan (L), bronze medalist Guo Yue, all of China, pose for group photo at the awarding ceremony of the women's singles of Beijing Olympic Games table tennis event in Beijing, China, Aug. 22, 2008.

Gold medalist Zhang Yining, silver medalist Wang Nan, and bronze medalist Guo Yue, all of China, witness the Chinese national flag hoisting up at the awarding ceremony of the women's singles of Beijing Olympic Games table tennis event in Beijing, China, Aug. 22, 2008.

BEIJING, Aug. 22 (Xinhua) -- World number one Zhang Yining won her fourth Olympic gold, beating teammate Wang Nan 4-1 in an all-Chinese women's singles table tennis Olympic final here Friday evening.

Zhang won 8-11, 13-11, 11-8, 11-8, 11-3, becoming the third Chinese table tennis player to pocket four Olympic golds, after legendary Deng Yaping and Grand Slam veteran Wang.

It was also the 19th Olympic gold medal that China won in table tennis since its national sport was introduced at the 1988 Seoul Games.

With a 4-2 win over Singapore's Li Jia Wei, China's Guo Yue finished third, a disappointment for the world champion who had rarely finished lower than second in international singles tournaments in the last two years.

Guo failed to reach the final because of her 4-2 loss to "Big Sister" Wang, who is going to retire and determined to win as much as possible at her last Olympic Games.