Andrey Rublev suggested he had given up hope at 5-0 down in the deciding tie-break against Holger Rune.
Rublev prevailed 6-3 3-6 6-3 4-6 7-6 (11-9) in a three-and-a-half-hour thriller against the Dane on Monday to progress to the quarter-finals of the Australian Open.
The Russian salvaged two match points to force a tie-break at the end of the fifth set, but found himself staring down the barrel of an exit from the season's first major as Rune cruised into a commanding lead.
Yet Rublev won nine of the next 11 points and, at the third attempt, sealed a remarkable victory when a shot that hit the net cord trickled just over.
"Yes, I was lucky," Rublev said in his post-match press conference.
"I started to think it's over, for sure. Somehow... I was able to start to play with much more focus."
Asked how he maintained his self-belief, Rublev quipped: "I was not believing."
"Beginning of the fifth set, I was completely frozen. Inside I was thinking that I cannot [win]. I cannot move. I cannot hit.
"I was thinking it's over. He's playing much better than me. He deserves to win. He's going for the shots. He's doing something that normally I am supposed to do if I want to win the match.
"I let it go. Somehow the stress that I had, I was able to relieve it. At the end of the match I played much better than during the rest of the match."
During his on-court interview, Rublev said: "I was never able to win matches like this, this is the first time I've won something like this.
"At a very special tournament, to be in a quarter-final, it's something I'll remember all my life. I'm shaking!"
Rublev has qualified for his second Australian Open quarter-final, and his seventh at a grand slam. However, he has lost all of those matches.
The world number six, seeded fifth in Melbourne, has won three successive matches that have gone the distance, a career-first. Now, he will meet nine-time champion Novak Djokovic, who defeated Alex de Minaur in straight sets.
"I don't know," Rublev replied when asked if Djokovic was unbeatable.
"Novak is very tough player to beat, especially in the slams.
"He has the best experience to win these matches. He's one of the best in history. The only chance I have is if I play my best tennis, just fight for every ball, and that's it. That's the only chance."
Rybakina extends winning streak to 10, Potapova upsets Gauff in Miami Open third round
Last week's Indian Wells Open champion Elena Rybakina has extended her winning streak to 10 matches after defeating Paula Badosa 3-6 7-5 6-3 in Saturday's Miami Open third round.
Kazakhstan's Rybakina, who is also the reigning Wimbledon Champion and Australian Open finalist, got the better of Badosa for the second time during her current run, also eliminating her from Indian Wells.
The 23-year-old has to be considered one of the favourites to go all the way, having knocked off world number one Iga Swiatek and world number two Aryna Sabalenka to lift the trophy in California.
Rybakina will meet Belgium's Elise Mertens in the fourth round after she beat Croatia's Petra Martic 6-4 6-3.
Meanwhile, the biggest upset of the day was delivered by Russia's Anastasia Potapova, bouncing sixth seed Coco Gauff 6-7 (8-10) 7-5 6-2.
Potapova, who has never won a tournament above the WTA 250 level, will face China's Zheng Qinwen for a spot in the quarter-finals after her three-hour 5-7 7-6 (7-5) 6-3 triumph over Liudmila Samsonova.
Latvia's Jelena Ostapenko, the 24th seed, eliminated Brazilian 13th seed Beatriz Haddad Maia 6-2 4-6 6-3, while 20th seed Magda Linette of Poland knocked out Belarusian 14th seed Victoria Azarenka 7-6 (7-3) 2-6 6-4.
Unseeded American Clare Liu went down 4-6 7-5 6-4 against Italy's Martina Trevisan, but third seed Jessica Pegula will continue to fly the flag for the United States after advancing 6-1 7-6 (7-0) in her all-American showdown with Danielle Collins.
Hurkacz survives marathon battle against Kokkinakis, Medvedev cruises into Miami Open third round
Hubert Hurkacz prevailed 6-7 (10-12) 7-6 (9-7) 7-6 (8-6) in a thrilling three-and-a-half hour battle against Thanasi Kokkinakis during Saturday's second round of the Miami Open.
It was Hurkacz's first match of the tournament after the eighth seed received a bye through the first round, and he came up against a match-fit Kokkinakis after the Australian went three sets in his opening victory.
The world number nine had to save five Kokkinakis match points before sealing the win with his first chance, three hours and 34 minutes after the contest began.
Kokkinakis was not the only Australian on the day to go down in a gruelling three-setter as 15th seed Alex De Minaur fell 6-7 (5-7) 7-6 (7-3) 7-6 (10-8) to Quentin Halys in three hours and 20 minutes.
It was far smoother sailing for fourth seed Daniil Medvedev in his 6-1 6-2 triumph over Roberto Carballes Baena, giving the Russian his first win since his 19-match unbeaten streak was ended at the hands of Carlos Alcaraz in the Indian Wells Open final.
The biggest upset of the day came from France's Gregoire Barrere as he eliminated 11th seed Cameron Norrie 6-3 6-2, before Adrian Mannarino ensured a great day for the French contingent with a 6-4 3-6 6-1 result against Ben Shelton in the late window.
Fifth seed Felix Auger-Aliassime needed a pair of tiebreakers to dispatch Brazil's Thiago Monteiro 7-6 (7-5) 7-6 (10-8), while big-serving 19th seed Matteo Berrettini came out on the wrong side of some tiebreakers in his 7-6 (10-8) 7-6 (7-5) loss to Mackenzie McDonald.
The skid from 18th seed Lorenzo Musetti continued as the 21-year-old went down 6-4 6-4 to Jiri Lehecka, giving the Italian seven losses from his past eight matches.
Karen Khachanov fought off the challenge of recent Chile Open finalist Tomas Martin Etcheverry 6-1 3-6 6-3, and second seed Stefanos Tsisipas received a walkover as Richard Gasquet withdrew.
'Special' Fullkrug can pull Germany along – Flick
Germany coach Hansi Flick credited Niclas Fullkrug with having the ability to "pull the team along" after the striker's double against Peru.
Fullkrug's two first-half goals ensured Euro 2024 hosts Germany claimed a routine 2-0 victory in their opening match of 2023.
Germany dominated Saturday's friendly in Mainz, and only a twist of the rules prevented Kai Havertz making it 3-0 in the second half, with the Chelsea forward's first-time finish on the rebound after he hit the post with a penalty disallowed as no other player had touched the ball.
Flick reserved special praise for Fullkrug, who has netted five goals in as many international games, and became the first Werder Bremen player to start for Germany since Serge Gnabry in 2016.
"Niclas is a player who is special, he is very confident, he wants to win and can pull the team along. He also gives the team a lot of positive energy," Flick told Sky Sport.
Sandro Wagner is the only other player this century to have scored five goals across his first five appearances for Germany.
However, there are elements for Fullkrug to work on, with Flick noting: "There were a few situations that I wasn’t happy with today.
"If we play forward, we have to have a certain seriousness about it.
"Niclas has also had one or two situations where he can be better, but he's still there for goals and he scored them."
Germany's game was their first since their disappointing showing at the World Cup, where they suffered a group-stage exit.
However, Germany are on a 13-game unbeaten run in friendlies (W8 D5) equalling their record, which was set between 1994 and 1996.
"I think you could see that the team played with a lot of dynamism, especially when it came to attacking," Flick said.
"A lot of things were good, but not yet at 100 per cent, although you couldn't expect because we didn't train very much.
"The team has never played together in this formation, but there were still a few situations that we played out well, where the last pass was missing.
"We scored two nice goals and kept a clean sheet, which was a focus for us this week."
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