Australian Open: Federer sails into semi-finals, will face Chung

Australian Open: Federer sails into semi-finals, will face Chung

But in Melbourne, Sandgren came out of nowhere to stun two top-10 players - Stan Wawrinka and Dominic Thiem - en route to being just the second man in the last 20 years to reach the quarterfinals on his Australian Open debut.

Defending champion Federer's 7-6, 6-3, 6-4 win over Tomas Berdych on Wednesday night extended his winning streak to 14 in Australian Open quarterfinals and to nine in that personal duel.

Federer had not dropped a set in his first four matches but was uncharacteristically lagging at the start as Berdych took a 3-0 lead in the first set.

6-3 6-4 win over 19th seed Tomas Berdych sets up a fascinating contest with 21-year-old South Korean sensation Hyeon Chung for a spot in the final.

This is published unedited from the ANI feed.

"We have had some good ones over the years going back all the way to the Olympic Games in Athens in 2004", the 19-time Grand Slam champion said of the Czech. Those are two major aspects to the game. A rising star on the ATP World Tour, Chung has beaten Novak Djokovic & No.4 Alexander Zverev on route to the last four and will be eyeing the scalp of one of the all-time greats to progress to the final.

"I'm very excited to play Chung, I thought he played an incredible match against Novak (Djokovic)", he said.

The first one was Atilla Savolt, and that was at the Open 16 years ago with Federer prevailing in straight sets. "I am happy for him, he's through his back issues from last year and I had a good match with him here in the third round last year", Federer said.

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"I was just frustrated and a bit antsy". Obviously I respect him a lot because he's a hard worker, he's disciplined, he's a nice guy, he's quiet.

A finalist at the U.S. Open in 2009 and 2014, Wozniacki needed three sets to beat Mertens on clay in a semifinal in Bastad, Sweden a year ago at their only previous meeting.

"He kind of forces you, I mean me, to kind of play on this edge where you're kind of doing some really cool things, and then you can fall off it and make some mistakes because he's forcing you to play so well". Got off to a good start there.

The Czech added: "I can play freely and I can have joy from the tennis".

"I'm looking forward to playing him". And he - just a little bit - bemoaned the draw that had him playing one of his nemeses rather than, say, an untested opponent like Chung, Tennys Sandgren or Edmund.

"I don't think that anyone is ever ready for that kind of thing", he said.

With the second set wrapped up moments later, Berdych headed off court for treatment to his back but showed no sign of injury on his return.