Novak Djokovic's Internazionali BNL d'Italia quarter-final with Stefanos Tsitsipas was halted by persistent rain on Friday with the world number one a set and a game down.
Reigning champion Djokovic, who is seeking a sixth triumph in Rome, struggled to get going against Tsitsipas and trails 6-4 2-1 ahead of the scheduled resumption of play on Saturday.
The top seed lost serve in the first game and continued to make some uncharacteristic errors that saw him trail 4-1 at one point.
While Djokovic did earn a first break in the sixth game, Tsitsipas stood firm to take the opening set and was in total control when again breaking his opponent early in the next set.
However, soon after the Greek had opened up a 2-1 advantage, the worsening conditions led to a pause in proceedings and organisers were eventually forced to bring the day's play to an end.
Djokovic, who converted just one of his six break point opportunities, will return to the court on Saturday and will need to improve if he is to join Rafael Nadal in the final four.
Nadal exacted some revenge on Alexander Zverev earlier on Friday to reach the semi-finals for a 12th time.
The Spaniard lost to Zverev at the same stage of the Madrid Open seven days ago but responded to questions over his form by easing through this latest encounter.
Nadal, who saved two match points before beating Denis Shapovalov on Thursday, raced 4-0 ahead in the first set against Zverev and had little trouble seeing the job through.
Aiming for a record-extending 10th title in the Italian capital, Nadal saved all eight break points he faced in the second set to advance 6-3 6-4 in two hours.
"I played more solid than Madrid. Conditions are different," he said in his post-match interview. "Here the conditions are a little more normal. I was able to control a little bit more."
"I'm happy. I played a very solid match with not many mistakes, playing the way that I have to. It's an important victory for me against a great player."
Nadal will face Reilly Opelka for a place in the final, the American beating qualifier Federico Delbonis 7-5 7-6 (7-2) to reach his first ATP Masters 1000 semi-final.
Opelka entered the tournament on a six-game losing streak, but he kept his good run going in Rome by earning the only break of the opening set in the 12th game.
Both players held throughout the second set and it was big-serving Opelka who prevailed 7-2 in the tie-break.
The day's other quarter-final between Lorenzo Sonego and Andrey Rublev also fell victim to the bad weather and will get under way on Saturday.
'I will play Roland Garros if I feel competitive' – Nadal uncertain on French Open participation
Rafael Nadal is unsure as to whether he will be fit enough to feature at the French Open.
Nadal is embarking on a swansong season, having indicated he will retire after the 2024 campaign.
The 37-year-old is set to make his farewell appearance at the Madrid Open this week, with his campaign starting against American teenager Darwin Blanch on Thursday.
Nadal, now ranked 512 in the world, has played just five Tour-level matches this year, as he makes his comeback from yet another injury lay-off.
And the 14-time Roland Garros champion acknowledged on Wednesday that he would be unlikely to play at the French Open should it be taking place this week.
"If I was in Paris today, I wouldn't go out to play," he said.
"I don't think I'll be able to play at 100 per cent, but it's important to be able to play for the last time in Madrid.
"It means a lot to me to play on this court where I've had some great moments."
Thankfully for Nadal, the French Open does not take place until late May, giving him time to get fit.
"If I arrive in Paris the way I feel today, I will not play," he said.
"I will play Roland Garros if I feel competitive. If I can play, I play. If I can't play, I can't. It won't be the end of the world or the end of my career. I still have goals after Roland Garros, like the Olympics.
"Few weeks [ago], I didn't know if I would be able to play again on the professional tour. It's not perfect but at least I am playing and I can enjoy again, especially in the tournaments that are so emotional for me.
"I'm able to enjoy the fun that I can say, probably, goodbye on court. Without trying to confuse anyone, I don't know what's going to happen in the next three weeks.
"I'm going to do the things I have to do to be able to play in Paris. And if I can, I can and if I can't, I can't. I'm going to Paris if I feel like I'm good enough. I'm going to Paris if I feel capable enough to compete."
Nadal played three times in Brisbane in January, losing to qualifier Jordan Thompson and subsequently missing the Australian Open.
He featured twice in Barcelona earlier in April, losing to Alex De Minaur in the round of 32.
Nadal has won five titles in Madrid, though, and the tournament holds a special place for him, as he underlined his determination to compete.
He added: "Some moments I find myself enjoying being on court, playing against the best players again and I feel myself, more or less competitive, and other moments I feel limitations and it’s difficult.
"The goal is to be on court, enjoy it as long as possible. I mean, that's the thing, enjoy the fact that I will be able to compete one more time on the professional tour and here at home in Madrid, a place that gives me everything in terms of support.
"I am here giving myself a chance. If at some moment my situation improves, if I am able to find better feelings in my body, I need to be ready."
Osaka storms to victory in Madrid opener to end long wait for win on clay
Naomi Osaka comprehensively dispatched Greet Minnen on Tuesday to make a winning start to her Madrid Open campaign and earn a first win on clay for two years.
Japanese star Osaka triumphed 6-4 6-1 in only 79 minutes, swiftly booking a second-round clash against Liudmila Samsonova.
Osaka reached the last 32 at the WTA 1000 events on the hard courts of Indian Wells and Miami but had lost to Martina Trevisan at the first hurdle in the Open de Rouen on clay at WTA 250 level last week.
This was therefore a welcome return to form against Belgian qualifier Minnen and represented her first triumph on the surface since beating Anastasia Potapova at this tournament in 2022.
After an even start to the contest, the first set was level at 4-4. But Osaka then assumed full control, winning eight of nine games to race to victory.
Data Debrief: Osaka dominates on serve
Osaka was not broken at all in the match and allowed Minnen only one break-point opportunity across the whole contest.
She fired down eight aces to only three double faults, and won 13 of her 16 first-serve points in the second set.
Alcaraz: Stopping world's best Sinner not easy in Madrid
Carlos Alcaraz considers "dangerous" Jannik Sinner as the world's best player and the man to beat at the Madrid Open.
Sinner has won three titles in 2024, including his maiden grand slam crown at the Australian Open, and is the top seed in the Spanish capital.
Novak Djokovic is absent from the Masters 1000 tournament but will remain the top men's player regardless of how far Sinner advances.
And while the Italian's only appearance on clay this year saw him lose to Stefanos Tsitsipas in the semi-finals of the Monte-Carlo Masters, Alcaraz knows full well what he is up against should the pair cross paths.
"He's dangerous. He's the best player in the world right now," Alcaraz said in his pre-tournament news conference.
"I think [some people] think his tennis doesn't suit well to the clay, but he has had results on clay as well.
"He can win every tournament he goes to, and obviously I'm fighting with him and with Novak to be world number one. I'm trying to stay there, but honestly it is going to be difficult."
World number three Alcaraz was unable to compete in Monte-Carlo, as well as the Barcelona Open, due to an arm injury.
However, the Spaniard is relishing the chance of returning to clay-court action on home soil when his pursuit of a 14th Tour-level title begins against either Arthur Rinderknech or Alexander Shevchenko on Saturday.
"For me, it's really important to be at 100 per cent here in this tournament," he said. "Playing here is so special.
"It's the tournament where a lot of family can come to watch my matches, a lot of friends as well, and for me it's really special to play in front of my home crowd as well.
"I would love to play at 100 per cent just to give them the opportunity to enjoy my tennis and give myself the chance to get a good result here."
Alcaraz is aiming to become the first player to win three successive Madrid Open crowns and is on a collision course to meet Sinner in the final.
The 20-year-old ended Sinner's winning streak with victory in their BNP Paribas Open final showdown last month, with that a rare blemish for the latter.
While Sinner has been the best male player this year, boasting a record of 25 wins to two losses, he believes there is still room for improvement.
"I don't want to put pressure on myself," he told reporters ahead of the tournament. "I'm living a very positive moment, winning a lot of matches.
"I just try to keep going like this. In my mind, I know that I can and have to improve if I want to win more.
"I am searching for new opportunities and I feel like that every tournament I play, there can be a good opportunity trying to show that my level has raised.
"Showing what I have improved and that's for sure something that I would like to do here. This is a new opportunity, new tournament and we'll see how it goes."
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