Roger Federer passed his first serious test at the Australian Open on Monday by beating unseeded Tommy Haas in five sets to reach the quarter-finals of the first grand slam of the year.
The world number one's game inexplicably fell apart after he had cruised into a two-set lead but he regained his composure in time to win 6-4 6-0 3-6 4-6 6-2.
"I wouldn't call it an escape tonight. I was up two sets to love so I was never really close to losing this match," Federer said.
"I like to be pushed like this. I'm happy I had a tough one now and I'm still in the tournament."
