Rafael Nadal declared it was imperative to "follow the rules" on COVID-19 vaccinations after rival Novak Djokovic was told he faces being deported from Australia.
World number one Djokovic was left fighting for the right to compete at the Australian Open, a tournament he has won nine times, after authorities cancelled his visa.
A medical exemption was expected to allow Djokovic to enter the country, regardless of his vaccination status, which he has yet to formally disclose.
However, the Australian Border Force declared the Serbian had been ordered to fly out of the country on Thursday, sparking a challenge to that decision by Djokovic's legal team.
Reports in Australia said an interim injunction had been granted, meaning Djokovic will remain in immigration detention until a court hearing on Monday.
According to Nadal, who had COVID-19 recently but has been cleared to compete at Melbourne Park, Djokovic would have made his life a lot easier by going down the vaccination route.
"It's normal that the people here in Australia get very frustrated with the case because they have been going through a lot of very hard lockdowns, and a lot of people were not able to come back home," Nadal said.
"The only thing that I can say is I believe in what the people who know about medicine says, and if the people say that we need to get vaccinated, we need to get the vaccine.
"I went through COVID. I have been vaccinated twice. If you do this, you don't have any problem to play here. The world in my opinion has been suffering enough to not follow the rules.
"I think if he wanted, he would be playing here in Australia without a problem. He made his own decisions, and everybody is free to take their own decisions, but then there are some consequences."
Djokovic was initially detained at an airport after arriving in Australia, while his status remained in limbo. His coach, Goran Ivanisevic, said it had been "not the most usual trip Down Under".
Spanish superstar Nadal has 20 grand slam titles, the same number that Djokovic and Roger Federer have brought up across their careers. They are locked in a race to finish with the most majors, and Federer, at 40, is battling back from injury and unlikely to compete at a slam before the US Open.
Australia's Prime Minister Scott Morrison tweeted on Thursday: "Mr Djokovic's visa has been cancelled. Rules are rules, especially when it comes to our borders.
"No one is above these rules. Our strong border policies have been critical to Australia having one of the lowest death rates in the world from COVID, we are continuing to be vigilant."
Nadal has some sympathy for Djokovic, but it appears to be limited.
"Of course, I don't like the situation that is happening," Nadal said. "In some way I feel sorry for him. But at the same time, he knew the conditions since a lot of months ago, so he makes his own decision."
Wawrinka reflects on 'tough year' after reaching ATP 1000 hard-court milestone
Stan Wawrinka reflected on a "really tough year" after racking up a new ATP 1000 milestone with his first-round victory over Giovanni Mpetshi Perricard at the Shanghai Masters.
The three-time grand slam champion secured a 7-6 (7-2) 7-6 (8-6) victory in China in what was the first ATP meeting between the two.
According to Opta Ace, it represented Wawrinka's landmark 100th hard-court victory in ATP 1000 events, becoming the 12th player to do so.
Speaking on court after the victory, the veteran 39-year-old said: "It's been a really tough year so far, but I'm not getting younger so I'm trying to keep pushing myself.
"I'm happy with the match. I think it was a really good level. I was playing really good, one of the best matches of the year for me.
"He's such an aggressive player. It was great to be here, so much support here, so I'm enjoying my time in China."
Wawrinka, who only had five ATP wins this year before featuring in Shanghai, next faces Flavio Cobolli in round two.
Gauff rallies back against Starodubtseva to reach China Open semi-final
Coco Gauff came from behind to defeat Yuliia Starodubtseva and reach the semi-finals of the China Open.
Gauff was no match for the qualifier in the first set of Thursday's tie, but the American rallied back to win 2-6 6-2 6-2.
The world number six will face Paula Badosa, the 15th seed, on Saturday.
She is vying for a place in her first final since she triumphed in Auckland in January, and her first at a WTA 1000 event since she won the Cincinnati Open in 2023.
Data Debrief: Comeback queen
Including retirements, Gauff (two) has achieved multiple match wins from a set down at a single WTA 1000 event for the first time in her career, and for the first time at a single WTA event overall since last year's US Open.
Since the format's inception in 2009, meanwhile, only Caroline Wozniacki (eight) has reached more WTA 1000 semi-finals than Coco Gauff (seven) before turning 21. World number one Iga Swiatek (five) is the only other player to reach 5+ semi-finals over that span.
Badosa stands between Gauff and the final. She beat home hope Zhang Shuai in the quarters, and became the second Spaniard to reach the semi-finals of the China Open since the inception of the tournament in 2004 after Garbine Muguruza in 2015.
She is the second oldest player to reach the semi-finals of the China Open in their maiden appearance after Amelie Mauresmo in 2006.
Alcaraz lauds 'beast' Sinner after winning China Open classic
Carlos Alcaraz described Jannik Sinner as "a beast" and the world's best player after downing the Italian in Wednesday's remarkable China Open final.
Alcaraz and Sinner battled it out for over three hours in the Beijing showpiece match, with Alcaraz eventually triumphing 6-7 (6-8) 6-4 7-6 (7-3).
The Spaniard took the decisive tie-break with a remarkable run of seven straight points, having lost a tie-break in the opening set to fall behind.
At the age of 21 years and 150 days, Alcaraz is the youngest player to defeat the world number one in an ATP event final after losing the opening set since Juan Martin del Potro (20 years, 356 days), who came back to beat Roger Federer at the US Open in 2009.
Speaking after his sixth career win over the Italian (four defeats), Alcaraz outlined his belief he had overcome the very best in the sport.
"He could have won in two, I could have won in two, he could have won in three. It was a really close match," said Alcaraz.
"Jannik, once again, he showed that he's the best player in the world, at least for me.
"The level that he's playing, it's unbelievable. It's a really high quality of tennis. His shots, physically, mentally... he's a beast."
Sinner breezed into a 3-0 lead in the third-set tie-break, only for Alcaraz to show extraordinary resilience to maintain his 100% record against Sinner this year, having previously beaten him at Indian Wells and Roland Garros.
"I never lost hope. Honestly I knew that every tie-break Jannik plays is almost on his side," Alcaraz said of the decider.
"I thought that in the third set, I'm not going to lie down after two mini-breaks for him. I thought, 'okay, I have to give everything that I have just to try to give myself the opportunity to be close'.
"During the whole week I've been playing great tennis. Probably sometimes the luck went to my side a little bit in the matches."
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