Haas pushes Federer to the limit as Hingis wins again

ROGER Federer was given a serious fright by unseeded Tommy Haas before squeezing into the Australian Open quarter-finals, and Martina Hingis had to dig deep to keep her dreams alive.

Haas, who beat the world number one at Kooyong this month, looked capable of doing so again, rattling the top seed with his aggressive volleys and ground strokes, forcing an uncharacteristic 58 unforced errors from the Swiss.

The grunting German stormed back from two sets down to take it to a fifth before the world number one composed himself to haul himself back into contention and eke out a 6-4, 6-0, 3-6, 4-6, 6-2 victory in just under three hours.