Serena Williams: I never give up

Serena Williams came from a set down to beat fellow mother Tsvetana Pironkova and reach the semi-finals of the US Open on Wednesday. The American third seed overcame the unseeded Bulgarian 4-6, 6-3, 6-2 in 2hr 12min inside Arthur Ashe Stadium. Williams will play former World No. 1 Victoria Azarenka for a place in Saturday's...