Australian Open: Rafael Nadal, Petra Kvitova through to semifinals

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Rafael Nadal is back to feeling healthy.

Ruthless Rafael Nadal continued his relentless progress to reach the last four of the Australian Open as he slayed giant-killer Frances Tiafoe 6-3 6-4 6-2 on Tuesday. In the quarter-finals, he was up against the experienced Roberta Bautista Agut, who had not lost a match since the beginning of the year.

"Not easy situations", he said, summing it up. "So it's the first semifinal of the second career", Kvitova said.

But he was then left speechless and blushing when McEnroe responded: "You could have fooled me, it looks pretty damn good to me".

"I knew if he got hold of a forehand, it was going to be barbecued chicken", said Tiafoe.

"I knew he was going to bring insane intensity, I knew the ball was going to be jumping", said Tiafoe.

"Being honest, I saw the first set".

He missed Roland Garros in 2016 with an injury and skipped the clay season the last two years.

Once more, Tsitsipas recovered from a break down to take the set, converting his third set point with a deft shot which found the line.

World No.2 Kerber was also sensationally bundled out by a woman playing the event for the first time, with American Danielle Collins humiliating the Wimbledon champion 6-0, 6-2 in under an hour.

As usual, Tiafoe was animated and talkative Tuesday.

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"Take as long as you want, Rafa", shouted one fan.

But it all came to a screeching halt against Nadal, a 17-time major champion.

Tiafoe fought hard and in fact served exceptionally well for most part of the match but could not break Nadal even once in the match. He's been reluctant to go into detail about a recent tweak he made to his serve, saying it's "nothing drastic, nothing dramatic".

Tsitsipas was just six weeks old when Federer won his first professional tennis match and he admitted in the lead-in to the match that he used to study the Swiss great on YouTube in an attempt to mirror his style.

Whatever he's doing is working.

Quizzed about the upcoming players on tour who have surged through the final eight, including Tiafoe and Tsitispas, Nadal said light-heartedly: "A couple of rounds ago I said "they can wait a little bit".

Federer will continue his bid for a record seventh Australian Open title against Greece's Stefanos Tsitsipas in the fourth round on Sunday.

20yo Stefanos Tsitsipas has become the youngest player to reach a Grand Slam semi-final since 2007 as he stormed to the last four of the Australian Open, but who exactly is the player being heralded as the sport's next big thing? "Will be a tough one", Nadal said.

"When I'm desperate sometimes, when I feel down, I do these videos".

" I said my goal this year was a Grand Slam semi, I thought I was insane, but no, it is real - it just happened".