World champion withdraws from Singapore Open with calf injury Press Trust of India Singapore, August 21 World badminton champion Xia Xuanze of China pulled out of the Singapore Open today with a calf injury - leaving the bottom half of the draw without a clear favourite. "It's the left calf. I can't walk properly... I don't really remember how I managed to finish the match," said Xia of the injury he suffered in the second round against Malaysia's Ong Ewe Hock. Xia said he felt a slight twinge midway through the second set and a pull at 4-4 in the deciding third set, but still managed a 15-8, 12-15, 15-12 win. "I'm really disappointed. This is a high quality tournament," he said. He may pull out of next week's Indonesian Open on Batam island. Last month, Xia won the world championships in Birmingham, England. His withdrawal gives unseeded Peter Gade of Denmark his best chance of winning a tournament since the US Open last year. The former All-England champion is desperately trying to earn enough ranking points to qualify for the Athens Olympics next year. "I missed the last two Singapore Opens due to injury and it is now a very different situation for me," said Gade. "My rankings have slipped and because I am usually unseeded, I tend to meet the good players in the early rounds." Gade upset second seed and compatriot Kenneth Jonassen 15-3 15-12 early today.