Nick Kyrgios

Nadal appeared to be struggling throughout his epic five-set quarter-final win over Taylor Fritz on Wednesday, and it was later confirmed the 22-time grand slam champion had suffered a seven-millimetre abdominal tear.

The two-time Wimbledon champion then announced his withdrawal from the competition at a news conference on Thursday, saying he doubted his ability to win two matches while enduring the pain.

Nadal's exit means Kyrgios will become Australia's first male Wimbledon finalist since Mark Philippoussis in 2003, and is the first player to receive a semi-final walkover in the competition in the Open Era.

The enigmatic 27-year-old has since taken to Instagram to wish the Spaniard well, writing: "Different players, different personalities.

"I hope your recovery goes well and we all hope to see you healthy soon. 'Till next time…"

The Australian has enjoyed a heated rivalry with Nadal since beating him in their first head-to-head meeting at Wimbledon in 2014, with the pair engaging in a couple of high-profile spats.

Kyrgios will now face either Novak Djokovic or Cameron Norrie in Sunday's final, as he bids to become the first Australian man to win Wimbledon since Lleyton Hewitt defeated David Nalbandian in 2002.

He has embarked on a box-office run in SW19, coming through five-set thrillers against Paul Jubb and Brandon Nakashima, as well as winning a fiery third-round contest against Stefanos Tsitsipas.

Some 6,944 days will have passed since an Australian man played in a Wimbledon final by the time Kyrgios takes to Centre Court on Sunday, though he will look to fare better than Philippoussis did in 2003's straight-sets loss to Roger Federer.

World number 40 Kyrgios is also the lowest-ranked – and the first unseeded – Wimbledon finalist since Philippoussis (number 48), as well as the lowest-ranked grand slam finalist since Marcos Baghdatis (number 54) at the 2006 Australian Open.

The 22-time grand slam winner aggravated an abdominal injury during his five-set victory over Taylor Fritz in the quarter-finals, admitting he had been in pain on court.

It did not prevent Nadal lasting the distance in a stirring battle lasting four hours and 21 minutes, taking the decider on a tie-break.

But Nadal risks having to pull out of Friday's semi-final against Australian Nick Kyrgios if his body is judged to have taken too much of a battering.

Family members appealed to Nadal to give up the ghost against Fritz, but the 36-year-old played on and pulled off a typically gutsy victory.

He confirmed after the match: "Tomorrow I'm going to have some more tests. But [it is] difficult to know. It's obvious that I am a player who had a lot of things in my tennis career, so I am used to have things and I am used to hold pain and to play with problems.

"Knowing that, when I feel something like I felt, that is because something is not going the proper way in abdominal. But let's see. I had these feelings for a couple of days."

Nadal said it was undoubtedly "the worst day" for his abdomen since he first felt a strain, which had required strapping before he played Fritz.

He said there had "been an important increase of pain and limitation", but Italian player Fabio Fognini appeared to question Nadal's injury status when he posted a message in an Instagram story, reacting to a report pointing out the Spaniard's problem.

The message read: "For sure... Guys stop believe in what you read PLEASE."

But Fognini later denied that meant he was questioning Nadal's injury, accusing journalists of twisting his words.

He wrote: "It's time to stop writing and reporting everything that you want in the wrong way. With that I wish Rafa and his entire team a lot of good luck in this Wimbledon final."

Former Spain goalkeeper Santiago Canizares, who now works in the sports media, also weighed in, writing on Twitter: "If there is anyone to believe in this society, it is @RafaelNadal. For many reasons that I am too lazy to cite.

"There are those who doubt his injury yesterday, but one fact does not bear debate: his serve was 30 per cent less than his usual speed... Usual almost 200 km/h. Yesterday 150/160 km/h"

That did not quite stack up across the entire match, but Nadal's average serve speeds (107mph for first serve, 95mph for second serve) were his slowest of the tournament so far.

Nadal has already won the Australian Open and French Open titles this year, defying a long-time foot problem. Should he play on and win Wimbledon, he would go to the US Open in August with a chance of achieving the first men's singles calendar Grand Slam clean sweep since Rod Laver achieved the feat in 1969.

The winner of the semi-final between Nadal and Kyrgios, should it go ahead as planned, will face the winner of Novak Djokovic's match against Cameron Norrie in the title match.

The 22-time grand slam winner recovered from behind to edge Fritz 3-6 7-5 3-6 7-5 7-6 (10-4) in a thrilling contest on Centre Court on Wednesday.

Nadal called for a medical time-out in the second set and never fully recovered from the issue, with his movement restricted throughout the four-hour-and-20-minute battle.

However, Nadal showed incredible mental and physical resilience to dig deep and see off first-time grand slam quarter-finalist Fritz and set up a showdown with Kyrgios.

Speaking in his on-court interview, the Spaniard admitted he was not entirely sure he would be able to see out his quarter-final tie after playing through the pain barrier.

"The body in general is fine," he said. "The abdominal [area] is not going well. I had to find a way to serve a little bit different.

"For a lot of moments I was thinking I will not be able to finish the match, but the court energy was something else.

"I honestly enjoy a lot playing these kind of matches, in front of you guys, I can’t thank you enough. It has been a tough afternoon. [Fritz] is a great player, all the credit to him.

"He's been great the whole season. But from my personal side it was not an easy match at all, so I'm just very happy to be in the semi-final.

"I hope to be ready to play it. Nick is a great player on all surfaces but especially on grass, he is having a great grass-court season.

"It's going to be a big challenge and I'm going to need to be at my 100 per cent to have a chance, and that is what I'm going to try to do."

Nadal has now won all eight quarter-finals contested at Wimbledon and is on a 19-match winning run at grand slams – three short of his own record of 21, which he set in 2010.

The victory over Fritz marked only the second time Nadal has won a fifth-set tie-break at a major, having previously prevailed against Dominic Thiem at the 2018 US Open.

It was also the first time since the same stage four years ago, against Juan Martin Del Potro, that Nadal has come through a five-set match at Wimbledon.

He has two days to recover ahead of facing Kyrgios, who had earlier defeated Cristian Garin in straight sets to reach a first grand slam semi-final.

"Tomorrow I'm going to have some more tests. But it's difficult to know [how I'll feel]," Nadal said when providing a further update on his fitness.

"It's obvious that I am not the kind of player that I didn't have a lot of things [injuries] in my tennis career, so I am used to have things and I am used to hold pain and to play with problems.

"Knowing that, when I feel something like I felt, that is because something is not going the proper way. But let's see. 

"It's obvious that today is nothing new. I had these feelings for a couple of days. Without a doubt, today was the worst day.

"There has been an important increase of pain and limitation. I managed to win that match. Let's see what's going on tomorrow."

Nadal leads Kyrgios 6-3 in their previous nine career matches, including victories in two of their three meetings in majors.

It is difficult to imagine Rafael Nadal, Roger Federer or Novak Djokovic coming out with such a line – but then Nick Kyrgios does not pretend to be comparable to any of those tennis greats.

Kyrgios' maiden major singles final appearance has come about due to unprecedented circumstances, with a tear to Nadal's abdominal muscle making his opponent the first to benefit from a walkover in a Wimbledon semi-final in the Open Era.

"It's not the way I wanted to get to the final," said Kyrgios in the same news conference on Friday.

But injuries are becoming increasingly commonplace for the 'Big Three' – already trimmed from a 'Big Four' due to the fitness woes endured by Kyrgios' great mate Andy Murray.

So, does the first-time finalist see an opportunity to step into that void at the forefront of the sport?

"No, no, I don't," Kyrgios replied. "I don't think anyone's able to fill those shoes."

He added with a grin: "If I ever win a grand slam trophy, please don't put the pressure on my to do another one."

This might be Kyrgios' first and only title run, but it is one he has waited a long time for.

"I saw some of the professionals walking around when I'd be a junior here, and I never thought that I'd be playing for the actual men's title," he said.

"It's the pinnacle of tennis. Once you're able to raise a grand slam trophy, it's like: what else is there to achieve?

"I never thought I'd be here, and I'm just super proud and ready to go. I'm going to give it my all and see what happens."

Australia has waited a long time, too. Aussies have won six Wimbledon men's singles titles but none since Lleyton Hewitt's sole success in 2002.

Their last finalist was Mark Philippoussis in 2003, beaten by Federer for his first championship. By Sunday, 6,944 days will have passed since an Australian man walked out for a singles final on Centre Court.

That sort of legacy does not appeal to Kyrgios, though, as he explained: "The greats of Australian tennis haven't been the nicest to me, and they haven't always been the most supportive – they haven't been supportive these two weeks."

Hewitt is an exception – the Davis Cup captain was briefly a hitting partner prior to the tournament – but Kyrgios considers himself "definitely the outcast of the Australian players".

"It's pretty sad," he said, describing his relationship with other Aussie greats as "weird". "They have a sick obsession with tearing me down. It sucks."

No, rather than bid to join those ranks, Kyrgios believes he is inspiring others like him.

"I grew up in Canberra, the courts I trained on were horrible, and now I'm here with the chance to play the Wimbledon final," he said.

"I think it's honestly an inspiration for any kid who's been 'outcasted' or been surrounded by negative headlines or negative clouds or been brought down from a lot of different angles.

"It's possible, it's still possible to achieve something quite special if you just believe in yourself. I never really lost belief in myself."

There have certainly been no shortage of negative headlines.

Kyrgios spat at a spectator earlier in the tournament; his epic third-round win over Stefanos Tsitsipas was one of the matches of the fortnight, but his typically brash approach to that encounter was not widely popular; and when he spoke of having already prepared tactics for Nadal – a previous foe – it was easy to wonder whether Kyrgios intended to outplay his opponent or simply get under his skin.

More seriously, this week started with Kyrgios being summoned to appear before a court in Canberra next month to face an allegation of common assault.

Those Australian greats would not be alone in responding to a Kyrgios victory unenthusiastically, even if the Centre Court crowd appear to have warmed to him.

No amount of noise will be new to Kyrgios, and while this is his first major singles final, a doubles title at the Australian Open provided some vital preparation for getting to this stage, too.

"I realised in Melbourne that it's a long time; it's a really long time in one place," Kyrgios said.

He was ready then for the rollercoaster of a grand slam run: "I beat Paul Jubb 7-5 in the fifth set in my first round, and now I'm in the Wimbledon final. You've just got to ride the waves, roll with the punches.

"In a grand slam, you just don't know; you could be four points away from losing the tournament and then 11 days later you're in the final."

There is undeniable excitement at the opportunity that lies ahead of Kyrgios, who considers himself "one of the most competitive people I've ever met".

But for once he will be able to see the bigger picture if Sunday's match does not go his way; Kyrgios is the first unseeded major finalist since Jo-Wilfried Tsonga at the 2008 Australian Open and the first unseeded Wimbledon finalist since Philippoussis.

"I just know whether I win or lose on Sunday, I'm going to be happy, because it's just such a great achievement that I never thought I'd be a part of – especially at 27," Kyrgios said.

"For me, I thought it was the later stages of my career; I just never thought that it would be right here that I'd have a chance."

Now he does have that chance, though, he is determined to give his all – something that has not always been a given with Kyrgios, his critics might suggest.

"Since I've been born, only eight people have won this title, only eight," he said. "I'm just going to give it my best shot."