Injured Zhao forced to withdraw in Dubai

China's Zhao Yunlei withdrew from both the women's and mixed doubles at the Dubai World Superseries Finals on Friday with a knee injury, as the semi-finalists were decided.

Zhao's exit meant that she could no longer partner women's partner Tian Qing or mixed partner Zhang Nan.

Eefje Muskens and Selena Piek of the Netherlands received a walkover in the women's doubles, as did Indonesian duo Tontowi Ahmad and Liliyana Natsir in the mixed doubles.

In other women's doubles results, Nitya Krishinda Maheswari and Greysia Polii of Indonesia defeated Christinna Pedersen and Kamilla Rytter Juhl 21-13, 21-17. That result sees both pairs into the semi-finals.

Japan Misaki Matsutomo and Ayaka Takahashi saw off Chinese pair Luo Ying and Luo Yu, though both pairs also advance from Group A.

The first men’s doubles clash of the day saw South Koreans Lee Yong Dae and Yoo Yeon Seong overcome Japanese stars Hiroyuki Endo and Kenichi Hayakawa 21-18, 21-12 to finish top of Group A and advance.

Indonesia's Mohammad Ahsan and Hendra Setiawan beat Fu Haifeng and Zhang Nan 21-14, 21-16 to also reach the knock-out stages, while Danes Mathias Boe and Carsten Mogensen defeated Chai Biao and Hong Wei 21-18, 21-19, though both teams advance in Group B.

In the mixed doubles, Praveen Jordan and Debby Susanto eased past Danish pair Joachim Fischer Nielsen and Chrisinna Pedersen 21-8, 21-18 to secure their passage to the knock-out stages.

South Korea’s Ko Sung Hyun and Kim Ha Na survived a second game fightback from Liu Cheng and Bao Yixin, winning 21-18, 13-21, 21-18 to advance to the semi-finals.

English siblings Chris and Gabrielle Adcock dispatched Hong Kong's Lee Chun Hei Reginald and Chau Hoi Wah 21-19, 16-21, 21-19, though both pairs move on to the semi-finals.