MELBOURNE－Defending champion Roger Federer reached the third round of the Australian Open for a 20th straight year on Wednesday, but admitted it had been tough to get past his "mirror image" Dan Evans.

Britain's world No 189 slowed the Fed Express to a crawl, keeping the Swiss master battling for more than two hours to win the opening two sets before finally succumbing 7-6(5), 7-6(3), 6-3.

Federer, the ageless 20-time Grand Slam champion who is gunning for a record seventh Melbourne Park title and third in a row, said he was given an unusual challenge by the 28-year-old, who plays a similar style of tennis.

"Playing a player like Dan Evans is like facing myself," said the 37-year-old. "It feels like playing a mirror a little bit. That was my mindset heading into it－h(huán)ow would I play myself potentially?"

Evans, whose ranking plummeted from a career-high 41 after he was slapped with a year-long ban for testing positive to cocaine in April 2017, played almost flawless tennis to stave off a set point on his way to forcing a tie-break in the opener.

He even had the temerity to lead 5-3 in the breaker before Federer stepped up a gear and reeled off the next four points to secure the set with a cry of "Come on!"

"It always helps when you sneak a break in the first set," said the Swiss star after a contest that lasted two and a half hours. "The match might have been different."

Federer said he had expected Evans to cause him more problems than when he cruised through their previous Grand Slam meeting at Wimbledon in 2016.

"I have high regard, you know, for Dan. I think he's a good player. I've seen him play some really good matches over the years. I see why he can cause difficulties," he said.

"He's got a nice slice, defends the court well. He has the variation, which is always a hard thing to play against.

'Cat and mouse'

"He was very sort of cat and mouse. I liked the match. It was enjoyable."

The loss of the first set after exactly an hour was harsh on Evans, who committed only two unforced errors and constantly put the third seed under pressure with his attacking game and flurry of winners off both wings.

The plucky Evans, who covered acres of ground and found the lines unerringly, needed treatment for blisters on both feet before the second set started and immediately was broken.

But he refused to lie down and broke back as Federer served for the set to force another tie-break.

"I thought I might have pulled away midway through the second set," said Federer. "But I couldn't. He played very well."

The Swiss great hasn't often needed luck during his stellar career but he took advantage of some in the third set to finally ease the pressure.

Holding break point at 2-1, he barely scooped up a half-volley that caught the net cord and toppled just over, forcing Evans to go long.

A service game to love followed to put Federer up 4-1 and the brave resistance of Evans was finally broken.

Federer will now play unseeded American Taylor Fritz in the last 32.

AGENCE FRANCE - PRESSE