Serena Williams, Wozniacki march into Auckland semis
Williams showed her class as she broke Siegemund and then held serve to take the first set.
Williams showed her class as she broke Siegemund and then held serve to take the first set.
Second seed Wozniacki, the former World No.1, prevailed 7-6 (2), 3-6, 6-4 over top seed Halep, who was bidding to win her first major title.
