TAN Boon Heong is adamant that his and doubles partner Koo Kien Keat's loss to a Korean scratch pair was a rare slip and the pair vowed to get their act together in their All England title defence in Birmingham next week.
Kien Keat-Boon Heong, the World No 3, were expected to cruise past Jung Jae Sung-Lee Jae Jin but instead suffered a stunning defeat on Sunday.
Boon Heong (right) says he and Kien Keat may have let down their guard since the team had already qualified for the Thomas Cup Finals.
Boon Heong said their performance level perhaps dropped as the team had already qualified for the Thomas Cup Finals in Jakarta on May 11-18 but nonetheless added that they were caught by surprise.
Apart from the setback against the Koreans, Boon Heong said they had a decent outing in Vietnam, especially their easy victory over Taiwan's Tsai Chia Hsin-Hu Chung Hsien, one of the lesser known pairs who had beaten them before.
"I think it (the defeat) was a rare blip where we didn't play well. Maybe our level dropped a little after having qualified for the final rounds. However, we will bounce back in the All England," said Boon Heong.
"Overall though, we had a good tournament and the win against the Taiwan pair was satisfying. I am more confident now especially playing against lower ranked pairs.
"We will face a tougher time in the All England compared to last year' s but we are confident of putting up a better performance.
"However, I would still focus on our first round against the Japanese pair and if we can clear them, things will get going for us."
Kien Keat-Boon Heong open their All England campaign against Japan's Shuichi Sakamoto-Shintaro Ikeda who bundled out the Malaysian pair in the quarter-finals of the World Championships last year, and will not take the match lightly this time.
Kien Keat-Boon Heong will also leave for Birmingham earlier (tomorrow) with national doubles coach Rexy Mainaky and singles player Lee Chong Wei to acclimatise.
The rest of the team leave for Birmingham on Saturday.