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Melbourne - Marin Cilic made his second Australian Open semi-final after world No 1 Rafael Nadal retired with a leg injury during a titanic struggle on Tuesday.
READ: Nadal crushed by latest injury setback
The world No.6 and former US Open champion won 3-6, 6-3, 6-7 (5/7), 6-2, 2-0 in 3hr 47min on Rod Laver Arena when Nadal pulled out in pain early in the fifth set.
He will play Britain's unseeded Kyle Edmund in an unexpected semi-final match-up on Thursday.
It was the second time Nadal has retired at the Australian Open after quitting his quarter-final win against Andy Murray in 2010 with a knee injury.
Cilic's first Australian semi-final came eight years ago when he lost to Murray.
Nadal was leading two sets to one before he called for the trainer and received a medical timeout trailing 1-4 in the fourth set.
He received treatment for an upper right leg injury and upon resuming his mobility was greatly affected and he lost the fourth set before calling an early end after losing a service break at 0-2 in the fifth.
"It was an unbelievable performance from the both of us and it is really unfortunate for Rafa, he's an unbelievable competitor, always gives his best and it's very unfortunate to finish this way for him," Cilic said.
"I guess in the pre-season he had some troubles with the injuries, but he came here prepared really well. He played a very good tournament. Obviously very sad for him to finish the way he did."
Cilic, who is coming off an outstanding 2017 where he lost to Roger Federer in the Wimbledon final and made the quarter-finals at Roland Garros along with climbing to a career-high ranking of four, said he was delighted with his form.
"Even in these other matches before this one, I played great tennis. Very high level," he said.
"I was always in the process where I want to keep going with my own game and try to lift up, keep pushing as much as I can. So I am extremely pleased with the performance."
Before Nadal's setback it had been a match of high quality, with Nadal edging ahead after a fluctuating third set tiebreaker.
Cilic was incensed to receive a time violation warning while serving down two break points and came up with a double-fault for a break at 2-3 in the second set.
But the Croat reeled off two service breaks and levelled the match 6-3 with an ace.
Nadal won a mighty tussle for the third set lasting 72 minutes which went to a tiebreaker.
The world No.1 held set point at 5-4 before Cilic held and in the tiebreaker a couple of Cilic misses gave Nadal his second set point which he took with an ace.
But Cilic would not be denied and he broke Nadal's serve in the fourth game of the fourth set, racing to a 4-1 lead.
Nadal took his medical timeout to seek treatment for his leg injury before resuming, but with difficulty.
Cilic broke him a second time to take the match into a fifth set but with Nadal noticeably limping between points, the Spaniard eventually walked to the umpire and conceded.
Cilic served 20 aces, with a fastest serve clocked at 215km/h (165 mph) and broke Nadal's serve five times, as well as hitting 83 winners and making 62 unforced errors.
Results from the Australian Open on Tuesday:
Men's singles
Quarter-finals
Marin Cilic (CRO x6) bt Rafael Nadal (ESP x1) 3-6, 6-3, 6-7 (5/7), 6-2, 2-0 ret
Kyle Edmund (GBR) bt Grigor Dimitrov (BUL x3) 6-4, 3-6, 6-3, 6-4
Women's singles
Quarter-finals
Elise Mertens (BEL) bt Elina Svitolina (UKR x4) 6-4, 6-0
