China's leading men's singles Lin Dan and Chen Jin both pulled out of the Hong Kong Badminton Open here on Friday before the quarterfinals, a bit later than they did here last year.

Xia Xuanze, men's singles coach of the Chinese national team, told reporters that Lin felt uncomfortable in his waist this morning while Chen suffered a foot injury in Thursday's second round match.

"Lin is too tired after so many matches in the past few weeks," he added.

In last year's Hong Kong Open, Lin quit without playing a single match while Chen gave up during the first round match due to an injury. Lin also played two rounds and called a quit before the quarterfinals in the China Open earlier this month.

Their retirement sent Vietnam's Nguyen Tien Minh and the top seed Lee Chong Wei from Malaysia directly into the semifinals.

The 21-year-old Chen Long became the only Chinese player left in the men's singles top four. The 7th seed came from one set behind to edge out South Korea's veteran Lee Hyun Il in a 77-minute clash. Chen was caught up from a comfortable lead of 18-13 in the third set before he recovered to seal the victory by 21-19.

Chen, winning his first super series title last week in China Open, will face the 3rd seed Taufik Hidayat of Indonesia in the semifinals.

The men's doubles saw another walkover of the day. Indonesia's Olympic Champion Markis Kido/Hendra Setiawan were sent into the semifinals by the retirement of compatriots Alvent Yulianto Chandra/Hendra Aprida Gunawan.

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