LONDON - China's Li Xuerui survived two ferocious comebacks by her top-seeded compatriot Wang Yihan to seal the women's singles badminton gold at the London Games on Saturday, capping her fairytale rise to the pinnacle of the sport. Li had never imagined she would force her way onto China's peerless badminton team but a 30-game winning streak in the leadup to the tournament won her a spot. India's Saina Nehwal celebrated her country's first Olympic badminton medal after she won the bronze medal decider when China's Wang Xin retired with a knee injury when leading 21-18 1-0.