Singapore's Ronald Susilo dumped third seed Chen Jin from the badminton world championships on Thursday, and immediately warned the formidable Chinese shuttlers against complacency.
Susilo, who has a reputation for defeating Chinese stars, downed Chen, who is ranked No.3 in the world, 21-19, 21-14 in a powerful performance to secure a spot in the quarter-finals.
Susilo, who clawed his way back up the rankings to No.11 after tearing his Achilles tendon at the 2005 worlds, said his strategy to play aggressively early had worked.
"I had to push myself 100 percent to attack and try as much as possible to win the first game because I thought the second would be much easier for me," said Susilo, who defeated world No.1 Lin Dan at the Athens Olympics.
Susilo, 28, said he wanted to prove here that other nations could compete at the same level as China, whose players monopolise the sport's world rankings.
"The Chinese players are very dominant. Everybody has the motivation to beat them and I am among them, because I want to prove that other countries can also compete," he said.
Chen, who finished his second-round match late on Wednesday night, conceded that he failed to capitalise on crucial points.
"It was a tough match and I have some lessons to take away from this," he said.
China's women's world No.1 Zhang Ning had no such problems against Maria Kristin Yulianti, motoring past the Indonesian to also book a place in the quarter-finals.
China's doubles combinations also secured quarter-final places with No.1 seeds Zhang Yawen and Wei Yili defeating South Korea's Lee Kyung Won and Lee Hyo Jung 21-14, 21-19.
Defending men's champions Fu Haifeng and Cai Yun walked over Russia's Vitalij Durkin and Alexandr Nikolaenko 21-10, 21-9.
China are seeking a clean sweep of all five titles here as they gear up for the Beijing Olympics next year.