Second seed Roger Federer marched into the semi-finals of the Australian Open with a 7-5 6-4 5-7 6-3 win over Argentina's David Nalbandian today.
The Swiss, who has dropped just two sets in the tournament, beat his opponent in just over two and a half hours to set up a showdown with world number three Juan Carlos Ferrero on Friday.
Federer snatched the first set from eighth seed Nalbandian with a break in the 12th game.
In the second, the Wimbledon champion twice recovered from a break down to stretch his lead.
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Nalbandian pulled a set back when he broke Federer in the 11th game of the third but the Swiss wrapped it up by winning the fourth.