Novak Djokovic has been burned by high expectations at the Olympics before, so it was little surprise that he should express only guarded optimism on the eve of the Tokyo Games.
The Serbian, who has won the Australian Open, French Open and Wimbledon already in 2021, is chasing the gold medal that would leave him one step away from the first tennis calendar 'Golden Slam' by a man.
Should he triumph in Japan over the next fortnight, Djokovic will head to the US Open in late August needing to win in New York to complete the full set.
Steffi Graf, who in 1988 won all the slams and gold at the Seoul Olympics, is the only player in tennis history to have completed such a sensational season.
Djokovic said such a feat was becoming a "more and more realistic" target, as he spoke in a Serbia team news conference, but the last time he stepped off the singles court at an Olympic Games, he was in tears, having lost in the first round at Rio to Juan Martin del Potro.
There is no danger of Djokovic running into his Olympic nemesis in Tokyo, with Del Potro, who also beat Djokovic in a bronze-medal match at the London 2012 Olympics, not a part of Argentina's squad as he battles back from four knee operations.
Looking at his own prospects for Tokyo and the rest of the year, Djokovic said: "It is still a long way to go ... I put myself in a very good position. But I will take things very slowly and cautiously.
"It's an approach I need to have because in the past I wasn't probably fully experienced in that approach. And I started to feel there were a lot of distractions around that influenced my performance.
"I know there are a lot of things on the line, a lot of history on the line. I'm privileged to be in this position. I worked very hard to be here, with my team, of course. But let's talk about history if everything goes great."
After his singles loss in Rio, Djokovic and Nenad Zimonjic lost in the second round of doubles to Brazilians Bruno Soares and Marcelo Melo.
A bronze from Beijing 2008 is all Djokovic has to show for his Olympics career to date, but he is a hot favourite for the title in Tokyo, where he will start against Bolivia's world number 139 Hugo Dellien.
The 34-year-old Djokovic said he "would be delighted to ask" Graf how she achieved her 1988 clean sweep.
"When I was thinking about her ultimate achievement ... I did not think it... I don't want to say 'achievable', but [I thought] there was a slim chance that someone could make it again, both male and female," Djokovic said.
"But right now it seems more and more realistic. Of course, it is one of my goals and dreams."
Djokovic has neither Roger Federer nor Rafael Nadal as rivals in Tokyo, with Federer missing after reporting a knee injury setback and Nadal electing to give the event a miss.
The 'Big Three' each have 20 grand slam titles now, following Djokovic's hot streak, and the Serbian admits it is unusual for both superstars to be absent.
"I have not experienced too many big tournaments in the past 15 years without Roger and Rafa playing. So it's a little bit strange," Djokovic said. "I'm used to seeing at least one of them. But still, some of the best players in the world are here.
"The guys who are in the top six, seven in the world, they are the biggest competitors or candidates for winning a medal. But potentially I am meeting with them in the later rounds."
After winning Wimbledon for a sixth time, Djokovic surprised many by claiming he could skip the Olympics, but he was reeled in by the appeal of representing his country, perhaps for the final time in the Games.
"Without the key element of any sports events – the crowds, the fans, that energy – it's different, but it is still the Olympic Games," he said.
"I was in a dilemma for a little bit, but I decided to come, and I'm glad because there are many more things that are beautiful about the Olympic Games. So I will try to focus on those things."
Sinner avoids O'Connell upset at US Open
Jannik Sinner beat Australia's Christopher O'Connell in straight sets to reach the fourth round of the US Open on Saturday, avoiding a similar fate to Carlos Alcaraz and Novak Djokovic.
The men's draw at Flushing Meadows has been blown wide open by early exits for Alcaraz and Djokovic, but the top seed remains in the hunt after a composed performance.
He reached the fourth round for a fourth consecutive year with a routine 6-1 6-4 6-2 victory, setting the tone with several huge groundstrokes in the opening set.
O'Connell never looked likely to fight back as Sinner smashed 46 winners in a ruthless performance, wrapping up his win in one hour and 56 minutes.
The Australian Open champion will face either Tommy Paul or Gabriel Diallo for a place in the last eight, and he was relieved to survive an opening week full of surprises.
"Everything can happen in this sport, so I try to stay on my side of the net and I'm trying to take the tournament day by day," Sinner said in his on-court interview after the win.
"Each opponent is a very tough challenge and [I am] also enjoying every moment on the court. There have been already a couple of upsets, so let's see what's coming.
"But I'm very happy to still be here and hopefully I can play as many matches as possible. But as I said, we go day by day and then we'll see how it goes."
Data Debrief: Sinner heating up
Sinner lost his first set of the tournament to Mackenzie McDonald but has been largely untouchable since then.
He has only lost 18 games across his last nine sets of tennis, an average of two per set.
The Italian's winning streak now stands at seven straight matches, meanwhile, following his triumphant Cincinnati Open run.
US Open: Sabalenka overcomes first set scare to progress in late start
Aryna Sabalenka came from a set down to keep her US Open dream alive as she beat Ekaterina Alexandrova in the early hours at Flushing Meadows.
Sabalenka emerged on court at the Arthur Ashe Stadium at seven minutes past midnight following Novak Djokovic's shock exit from the tournament, and consecutive upsets looked to be on the cards.
However, the Belarusian responded from a disappointing opening set as she looks to avenge her defeat in the showpiece match against Coco Gauff a year ago.
The world number two set up a meeting with Belgium's Elise Mertens as she emerged a 2-6 6-1 6-2 victor in one hour and 40 minutes in New York.
"I don't know what I did, I was just trying to stay low, put as many balls as I can back on that side," Sabalenka said.
"She played incredible tennis in the first set. It was really tough to change it."
"I'm really happy I was able to turn around this match and get this really difficult win. Thanks so much for staying that late."
Data Debrief: Sabalenka survives late, late show
Sabalenka's encounter with Alexandrova was the latest starting match at the US Open, beating Gabriela Sabatini and Beverley Bowes' meeting in 1987 that started at midnight.
The Belarusian, however, will be hoping for a much improved performance in the next round, having produced 27 unforced errors throughout the contest and serving four double faults.
US Open: Djokovic played 'worst tennis ever' in Popyrin loss
Defending US Open champion Novak Djokovic suffered a shock exit at Flushing Meadows as he lost in four sets to Alexei Popyrin.
Djokovic arrived at the tournament with confidence following his gold medal triumph at the Paris Olympics, and was tipped to lift a record-extending 25th grand slam title.
However, the Serbian's hopes of a fifth success in New York were dashed as he followed fellow favourite Carlos Alcaraz out of the competition in the third round.
Popyrin emerged victorious in three hours and 18 minutes, prevailing 6-4 6-4 2-6 6-4 to confirm Djokovic's earliest exit from the tournament in 18 years.
"I have played some of the worst tennis I have ever played," Djokovic said.
"Honestly, the way I felt and the way I played from the beginning of this tournament, third round is a success."
"I tried my best, I didn't have any physical issues. I just felt out of gas, and you could see that. From the first match, I just didn't find myself on this court.
"Life moves on. I'll try to recalibrate and look forward to what's next."
Data Debrief: Another one bites the dust
Djokovic was far from his clinical best, serving a career-high 14 double faults in a grand slam match and committing 49 unforced errors.
The Serbian will also end the year without winning a grand slam title, the first time he has done so since 2017.
But the day belonged to Popyrin, saving 12 of the 16 break points he faced against the world number two, finding particular success with his forehand as 31 of his 49 winners came from that shot.
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