Upset Alert! Rafael Nadal knocked out of Australian Open by Dominic Thiem

Thiem will next take on German tennis player Alexander Zverev for a spot in the championship match.

Melbourne:World Number five Dominic Thiem on Wednesday made a significant breakthrough at the Australian Open, upsetting World No. 1 Rafael Nadal 7-6(3), 7-6(4), 4-6, 7-6(6) at Rod Laver Arena to book his spot in the semi-finals of the event.

Austria's Thiem, 26, beat Nadal 7-6 (7/3), 7-6 (7/4), 4-6, 7-6 (8/6) -- his first win in six attempts at Grand Slams, including two French Open finals -- to end the 33-year-old's bid to equal Roger Federer's record 20 Major titles.

Thiem will next take on German tennis player Alexander Zverev for a spot in the championship match.

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Earlier Zverev, 22, beat 2014 champion Wawrinka, 34, to go into a semi-final with Thiem, meaning that one of them will reach Sunday's final against Roger Federer or Novak Djokovic, who have won 12 of the last 14 Australian Open titles.

Thiem had Nadal's measure in the first two sets and he recovered from dropping the third to win the fourth-set tie-breaker, getting off the floor after falling to win one point and enjoying some luck from the net cord to set up the third and decisive match point.

"I was lucky in the right situation -- the net cord was really on my side," Thiem said. "But it's necessary because he is one of the greatest of all time. You need some luck to beat him."

Several young players have been knocking on the door of the Big Three of Nadal, Federer and Djokovic, and either Thiem or Zverev will get a chance to kick it open in Sunday's final.

- 'Almost too focused' -
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Germany's Zverev rallied from a set down to halt three-time Major-winner Wawrinka 1-6, 6-3, 6-4, 6-2 and reach his first Grand Slam semi-final.

Big things have been tipped for Zverev since he burst into the top 10 in 2017, but he said that until now he has been pushing himself too hard at the Majors.

"I was doing things in a way too professional way. I was not talking to anybody. I wasn't going out with friends. I wasn't having dinner. I was just really almost too focused."

"I changed that a little bit this week... maybe this is how it should happen," he added.