World No. 1 Roger Federer came from a set down to overcome Russian Igor Andreev 4-6, 6-2, 7-6(2), 6-0 and booked his place in the second round of the Australian Open.

Federer was forced to save three set points in the 12th game of a rollercoaster third set before finally breaking Andreev's resolve.

The winner of 15 Grand Slam singles titles admitted he was pleased to have come through a tricky encounter.

"I knew it was going to be tough," said Federer. "We played five sets in New York two years back and that was extremely tough. I think he is a wonderful player. That was a tough first round and I am really, really relieved that I am through."