Federer battles back to take victory

Roger Federer came from two sets to love down to see off Tomas Berdych and reach the quarter-finals of the Australian Open.

Federer, who has won every one of their previous seven meetings since losing to Berdych at the 2004 Olympics, took three hours 29 minutes to get past the 20th seed and book a last-eight date with Juan Martin Del Potro.

At once stage Federer looked in serious danger of failing to reach the quarters at a grand slam for the first time since Roland Garros in 2004, but used all his experience to progress with a 4-6 6-7 (4/7) 6-4 6-4 6-2 win.