Chinese star Chen Jin pulled out of the India Open badminton tournament with a wrist injury after his Olympic berth was ensured on Friday.
Chen, who Thursday replaced Denmark's Peter Gade as the fourth-ranked player in the world, was scheduled to meet India's Parupalli Kashyap in the men's singles quarter-finals late in the evening.
The pull-out also helped Kashyap make it to the London Olympics.
"I was ready for the match. It's obviously a great feeling to be in the Olympics," said Kashyap.
Chen was assured of an Olympic place after second-seeded Gade lost 24-22, 21-18 to unseeded South Korean Wan Ho Shon in the quarter-finals early in the day.
He is now set to join compatriots Lin Dan and Chen Long, ranked number two and three respectively in the world, at the Olympics.
Chen will retain his number-four spot when the final world ranking list to determine the Olympic qualifiers is released on May 3.
A country can have three players in each singles event if they are ranked among the top four.
Kashyap now plays Wan Ho Shon, while top-seeded Malaysian Lee Chong Wei meets Chinese Taipei's Jen Hao Hsu in the other semi-final.
In the women's tournament sixth-seeded German Juliane Schenk pulled off the biggest upset of the day when she rallied to down top-seeded Chinese Wang Shixian 6-21, 21-10, 21-16 to move into the semi-finals.
The German will take on Chinese Chen Xiao Jia after unseeded Korean Youn Joo Bae, who upset third-seeded Indian Saina Nehwal in the previous round, failed to maintain her form and lost to Chen 21-17, 21-13.
The other women's singles semi-final will be an all-China affair, with second-seeded Li Xuerui taking on fourth-seeded Jiang Yanjiao.
Li recorded a 21-15, 21-11 win over Singapore's Gu Juan while Jiang overcame an opening-game loss to down Indian P.V. Sindhu 18-21, 21-12, 21-18.
Men's singles quarter-finals:
Wan Ho Shon (KOR) bt Peter Gade (DEN) 24-22, 21-18
Lee Chong Wei (MAS) bt Taufik Hidayat (INA) 21-16, 21-13
Parupalli Kashyap (IND) bt Chen Jin (CHN) walkover
Jen Hao Hsu (TPE) bt Hans-Kristian Vittinghus (DEN) 21-19, 21-18
Women's singles quarter-finals:
Juliane Schenk (GER) bt Wang Shixian (CHN) 6-21, 21-10, 21-16
Li Xuerui (CHN) bt Gu Juan (SIN) 21-15, 21-11
Jiang Yanjiao (CHN) bt P.V. Sindhu (IND) 18-21, 21-12, 21-18
Chen Xiao Jia (CHN) bt Youn Joo Bae (KOR) 21-17, 21-13
Men's doubles quarter-finals:
Angga Pratama/Ryan Agung Saputra (INA) bt Koo Kien Keat/Tan Boon Heong (MAS) 21-18, 15-21, 21-19
Bodin Issara/Maneepong Jongjit (THA) bt Rupesh Kumar/Sanave Thomas (IND) 21-12, 21-12
Sung Hyun Ko/Yeon Seong Yoo (KOR) bt Hong Wei/Shen Ye (CHN) 15-21, 21-17, 21-12
Shem Goh/Lim Khim Wah (MAS) bt Vladimir Ivanov/Ivan Sozonov (RUS) 21-17, 16-21, 21-10
Women's singles quarter-finals:
Miyuki Maeda/Satoko Suetsuna (JPN) bt Jwala Gutta/Ashwini Ponnappa (IND) 19-21, 21-13, 21-14
Mizuki Fujii/Reika Kakiiwa (JPN) bt Hye Won Eom/Ye Na Jang (KOR) 21-9, 21-17
Kyung Eun Jung/Ha Na Kim (KOR) bt Misaki Matsutomo/Ayaka Takahashi (JPN) 21-12, 23-21
Bao Yixin/Zhong Qianxin (CHN) bt Jung Eun Ha/Min Jung Kim (KOR) 18-21, 22-20, 21-16
Mixed doubles quarter-finals:
Sudket Prapakamol/Saralee Thoungthongkam (THA) bt Chan Peng Soon/Goh Liu Ying(MAS) 21-14, 15-21, 21-18
Tontowi Ahmad/Liliyana Natsir (INA) bt He Hanbin/Bao Yixin (CHN) 21-16, 21-14
Yong Dae Lee/Jung Eun Ha (KOR) bt Shintaro Ikeda/Reiko Shiota (JPN) 19-21, 21-13, 21-14
Jiaming Tao/Huan Xia (CHN) bt Shoji Sato/Shizuka Matsuo (JPN) 20-22, 21-14, 21-10