SINGAPORE (AFP) - China's badminton superstar Lin Dan was booed Sunday by spectators as he apologised for pulling out of the Singapore Open men's final against compatriot Chen Jin because of gastric flu. His withdrawal overshadowed compatriot Wang Xin's 21-19 and 21-17 win over Tine Baun of Denmark in the women's final at the Super Series tournament. Lin's apology, made right after the women's final, was drowned out by boos from the crowd of over 7,400 at the Singapore Indoor Stadium who had been hoping to see the Chinese ace in action against Chen -- who took the title by a walkover. "I can understand the reaction from the crowd just now," Lin, who is affectionately known as Super Dan to his legions of fans, said at a press conference. "I will come again next year to Singapore." It was the first time in Lin's career that he had pulled out of a final. "The China team manager had informed me that Lin Dan is ill and unable to play in the men's singles final," said tournament referee Ernest Robinson.