Roger Federer delivered a showcourt masterclass to surge into his 40th grand slam semi-final at Melbourne Park.

Federer crushed sixth-seeded Czech Tomas Berdych 7-6 (7-4) 6-2 6-4 for his record 80th Australian Open win.

Then the 17-time Grand Slam champion delivered an interview masterclass with Channel 7's Jim Courier immediately after the match.

The playful 34-year-old promised to deliver a shot that Courier wanted to see and then took an accidental dig at the American all in the space of two sentences.

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When asked by Courier why he hasn't performed the controversial Sneak Attack By Roger (SABR) move this tournament, Federer responded: "You want to see it?"

"I'll definitely play at least one in the next match. I'll put it that way. I enjoy playing it. You have to be in the right frame of mind. You have to be confident up there. Not that I'm not confident, but, I don't know, I'm just not feeling it quite yet.

"Maybe I'll just hit the practice courts and just do that tomorrow."

Then he accidentally delivered a brutal sledge to Courier and the player's of the four-time slam champ's generation.

"It's one point. Let's not get carried away," he said of his decision to try out the move in the semi-finals of a grand slam.

"One point's not usually going to decide a match any more. These days it's a lot of forehands. A lot of backhands. A lot of serves. A lot of running. It's not like it used to be."

Courier replied after a pause: "I understand, thankyou for that dig".

The peerless Swiss rode roughshod over Berdych, needing barely two hours to set up a last-four showdown on Thursday with world No.1 and defending champion Novak Djokovic.

Third-seeded Federer will be playing for a place in the title match in Melbourne for the first time since claiming a fourth trophy in 2010.

He should be bristling with confidence after breaking Berdych on five occasions and crunching 46 winners to romp into the Open semi-finals for the 12th time in 13 years.

- news.com.au