US Open champion Bianca Andreescu withdraws from Auckland's ASB Classic
Knee injury hobbles Canadian teen, Serena Williams now top seed.
US Open champion Bianca Andreescu has pulled out of the ASB Classic, less than two weeks before it starts. The Canadian's withdrawal has robbed the tournament of its top seed, with Serena Williams now taking that honour. Andreescu, 19, was a showstopper o… [+2758 chars]