Disgraced Chinese Yu Yang has decided to quit badminton while Chinese officials have told their Olympic team leaders and disgraced players to make a public apology for throwing matches at the London Games. Yu wrote on her Tencent microblog that this was last competition. Goodbye Badminton World Federation , goodbye beloved badminton.Yu was among eight women's doubles players expelled from the Games yesterday. The others were team mate Wang Xiaoli, South Korean pairs Jung Kyung-eun and Kim Ha-na, and Ha Jung-eun and Kim Min-jung, plus Greysia Polii and Meiliana Jauhari of Indonesia.