Intro:

China take four of five available titles on the final day of the Asian Badminton Championships on Sunday.

Script:

After advancing in a controversial semi-final walkover when his team-mate Lin Dan withdrew, China's Chen Jin could all but confirm his ticket to the London Olympics with a win over Du Pengyu in the Asian Badminton Championships men's singles final on Sunday.

Chen showed his superiority over his compatriot as he ground out a two - love victory to claim the singles title.

It's a victory that should ensure Chen a spot in China's London Olympic squad.

There was an upset in the women's singles final, where fourth-ranked Li Xuerui beat her top-seeded and world-number-one team-mate Wang Yihan 2-1 to take the title.

But the script went to form in the all-China women's doubles final, with top seeds Tian Qing and Zhao Yunlei cruising to victory over Bao Yixin and Zhong Qianxin 2-0.

Zhao then picked up a second Asian title when she partnered Zhang Nan to defeat Xu Chen and Ma Jin in straight sets.

In the only final not featuring Chinese players, South Korea's Kim Ki-jung and Kim Sa-rang defeated Japan's Hiroyuki Endo and Kenichi Hayakawa 2-0 to win the men's doubles title on a day which was dominated by China, who took four of the five available titles Sunday.