Fourth-seeded Wang Yihan of China crashed out of the World badminton championships when she lost 21-18, 21-15 to German Juliane Schenk here on Thursday. 'The Chinese are very strong, but I don't think they are unbeatable,' 11th- seeded Schenk said after qualifying for the women's singles quarter-finals. 'I didn't have any goal coming into the tournament. I just believed in myself and focused on my game. I just wanted to do well and make her work hard for each point. It is a great feeling.' The German will now meet eighth-seeded Pi Hongyan of France, a 21-13, 21-14 winner against 15th-seeded Indonesian Maria Kristin Yulianti. Chinese Lin Dan and Peter Gade of Denmark earlier set up a repeat of their Olympic clash when they stormed into the men's singles quarter-finals. Lin, aiming to become the first shuttler to bag three successive world titles, proved too strong for Dicky Palyama of the Netherlands as he raced to a 21-11, 21-11 victory in 31 minutes. Third-seeded Gade beat 10th-seeded Chan Yan Kit of Hong Kong 21-11, 21-12 in another pre-quarterfinal encounter. 'The pressure will be on him because I think he won't like to lose to an old guy,' said the 32-year-old Gade, who was beaten by Lin in the quarter-finals of the 2008 Beijing Olympics. 'I have beaten him at home a few years ago, so I think I can beat him here also. I am going to give everything I have got. I am going to fight for each point. I can play freely because he is the favourite. 'I am so far happy with my performance. This is what I wanted to do before the quarter-finals. Chan played some wonderful shots, but I kept pressure on him. It will be a different match tomorrow.' Lin said he had not expected such an easy win against Palyama, who had upset 11th-seeded Chinese Bao Chun Lai in the opening round. 'I have met him before, but it was never as easy as today. I watched his game (against Bao) and knew what to expect,' said Lin, who won the World title in 2006 and 2007. 'But the match against Gade will be different as he played well in the Olympics also.' Indonesians Taufik Hidayat and Simon Santoso also qualified the quarter-finals. Fourth-seeded Hidayat beat ninth-seeded Yu Hsing Hsieh of Taipei 21-15, 21-19, while 13th-seeded Santoso downed Japanese Kenichi Tago 21-10, 21-12. World number one Zhou Mi of Hong Kong moved into the women's singles quarter- finals with a 21-11, 21-18 win over Japanese Ai Goto. Fifth-seeded Chinese Xie Xingfang overcame stiff resistance from Thailand's Salakjit Ponsana to make it to the last-eight with a 21-16, 14-21, 21-9 victory. The other women's singles quarter-finalists were Chinese Wang Lin and Lu Lan. Wang defeated 12th-seeded Korean Hwang Hye Youn 21-10, 23-21, while seventh- seeded Lu posted a 21-18, 21-14 victory over ninth-seeded Wang Chen of Hong Kong. 