HYDERABAD (India), Aug 14 Malaysian world number one Lee Chong Wei and women's top seed Zhou Mi of Hong Kong were knocked out in the quarter-finals of the World Badminton Championships on Friday.

Lee's hopes for a much-awaited last four clash against Chinese favourite Lin Dan were dashed when Indonesian sixth seed Sony Dwi Kuncoro defeated him 21-16, 14-21, 21-12.

Kuncoro, runner-up to Lin at the last edition in 2007, played superb cross-court smashes and took full advantage of Lee's below par netplay in a fast-paced encounter. He will face either Lin or Denmark's third seed Peter Gade in the last four.

In the women's draw, world number one Zhou was toppled 21-15, 21-18 by China's twice former champion and fifth seed Xie Xingfang.

Xie, the Beijing Olympics silver medallist who won in 2005 and 2006, wore down Zhou with long rallies, often pinning the former China player to the backcourt.

Former champion Taufik Hidayat halted Danish youngster Jan O Jorgensen's giant-killing run 21-19, 21-19.

The Indonesian fourth seed trailed 19-17 in the opening game against his unseeded 21-year-old rival, who toppled Korean eighth seed Park Sung-hwan and 16th seed Boonsak Ponsana of Thailand in the last two rounds.

However, the 28-year-old relied on his wealth of experience to clinch three superb points and pocket the first game before going on to win the match.

Hidayat will next take on Chinese second seed Chen Jin, who beat Indonesia's Simon Santoso 21-10, 21-13.

There was no Danish delight in the women's section either, after Chinese seventh seed Lu Lan knocked out third seed Tine Rasmussen 21-15, 21-13 in the quarter-finals.

Rasmussen, 30, just back after a four-month layoff due to a heel injury, made too many unforced errors and was often caught out by the speed of her younger opponent.

French eighth-seed Pi Hongyan rallied to down German 11th seed Juliane Schenk 15-21, 21-15, 21-19 and will face Xie in the last four.

Lu Lan will take on compatriot Wang Lin, the second seed, or Indian sixth seed Saina Nehwal.

Friday's results (prefix number denotes seeding)

Men's singles

Quarter-finals 5-Lin Dan (China) bt 3-Peter Hoeg Gade (Denmark) 22-20, 21-16; 6-Sony Dwi Kuncoro (Indonesia) bt 1-Lee Chong Wei (Malaysia) 21-16, 14-21, 21-12; 2-Chen Jin (China) bt 13-Simon Santoso (Indonesia) 21-10, 21-13; 4-Taufik Hidayat (Indonesia) bt Jan O Jorgensen (Denmark) 21-19, 21-19.

Women's singles

Quarter-finals 2-Wang Lin (China) bt 6-Saina Nehwal (India) 21-16, 21-19; 5-Xie Xingfang (China) bt 1-Zhou Mi (Hong Kong) 21-15, 21-18; 8-Pi Hongyan (France) bt 11-Juliane Schenk (Germany) 15-21, 21-15, 21-19; 7-Lu Lan (China) bt 3-Tine Rasmussen (Denmark) 21-15, 21-13.

Thursday's results

Men's singles

Pre-quarterfinals 5-Lin Dan (China) bt Dicky Palyama (Netherlands) 21-11, 21-11; 3-Peter Gade (Denmark) bt 10-Chan Yan Kit (Hong Kong) 21-11, 21-12.

Women's singles

Pre-quarterfinals 5-Xie Xingfang (China) bt Salakjit Ponsana (Thailand) 21-16, 14-21, 21-9; 1-Zhou Mi (Hong Kong) bt Ai Goto (Japan) 21-11, 21-18; 7-Lu Lan (China) bt 9-Wang Chen (Hong Kong) 21-18, 21-14.—Reuters