Australian Open: Federer saves match points to reach semis

Roger Federer defied age and logic once again to save seven match points before beating unseeded American Tennys Sandgren in a sensational Australian open quarter-final.

The out-of-sorts Swiss fought off form and fitness concerns before winning 6-3 2-6 2-6 7-6 6-3.

World number 100 Sandgren looked set to be the lowest ranked player to reach the Melbourne semi-finals since 1991.

But third seed Federer battled to win in three hours and 28 minutes.

The 20-time grand slam champion will play Serbia’s defending champion Novak Djokovic or Canadian 32nd seed Milos Raonic in the last four.