China moved closer to defending their titles in the Thomas and Uber Cups with easy quarter-finals victories on Wednesday.
World number one Lin Dan complained about the lights and air-conditioning but was still able to spark China's 3-0 victory over England with an 18-21, 21-12, 21-12 win over Andrew Smith.
China also won the doubles before Bao Chunlai sealed their place in the semi-finals of the men's world badminton team event by beating Nick Kidd 21-12, 21-15.
"I made some silly mistakes while I was ahead in the first game but it was just a case of getting used to the conditions in the gym," Lin told reporters.
"I found some form in the next two games after I came to terms with the lights and the cold from the air-conditioning."
China's men take on Indonesia in Friday's Thomas Cup semi-finals after the 13 times champions overcame hosts Japan 3-1.
Olympic and world champion Taufik Hidayat was stunned 20-22, 21-16, 24-22 by Shoji Sato in the opening rubber before the Indonesia side came roaring back to win the next three.
"It was always going to be difficult during the Thomas Cup," said Hidayat, who has been struggling with a back injury.
"I will work to get back to fitness when I get home."
DANISH JOY
Denmark eased into the semi-finals with a 3-0 victory over India. The seven-times silver medallists will face five-times Thomas Cup champions Malaysia in the semi-finals.
The Malaysians survived a scare to edge out South Korea 3-2 in a see-saw quarter-final.
Olympic champion Zhang Ning propelled China's women to another 3-0 whitewash with a 21-18, 21-18 victory over Li Li in their opening rubber against Singapore in the Uber Cup.
China were never seriously threatened in the doubles and Jiang Yanjiao completed the rout.
The Chinese are red hot favourites to win their fifth straight title in the women's team event. They play Germany in Thursday's semi-finals. The Germans beat Hong Kong 3-2.
The Netherlands compounded Japan's misery by beating the hosts 3-2. The Dutch women will take on Taiwan in the last four after they beat South Korea by the same score.