Naomi Osaka has expressed her concern over the situation of Peng Shuai, who has not been heard from publicly since accusing China's ex-vice premier of sexual assault.
Peng, a Wimbledon doubles champion in 2013, posted allegations against Zhang Gaoli on Chinese social media site Weibo last week.
The post, along with all of Peng's other content, has since been removed from the site.
Multiple reports suggested the 35-year-old had subsequently not been seen or heard from, and the Women's Tennis Association (WTA) called for a full investigation into the matter.
There has so far been no response from the Chinese government to the allegations.
However, a spokesperson for the ministry of foreign affairs informed reporters he was not aware of the situation.
"I have not heard of the issue you raised," the spokesperson said via a widely released statement. "This is not a diplomatic question."
Now Osaka, a four-time major champion and one of the biggest names in the sport, has used her platform to question the situation.
"Hey everyone, not sure if you’ve been following the news but I was recently informed of a fellow tennis player that has gone missing shortly after revealing that she has been sexually abused," Osaka wrote in a statement published to her official Twitter account.
"Censorship is never ok at any cost, I hope Peng Shuai and her family are safe and ok. I'm in shock of the current situation and I'm sending love and light her way."
Osaka concluded her post with the hashtag: "#whereispengshuai".
On Sunday, WTA chairman Steve Simon addressed the matter in a statement that said: "The recent events in China concerning a WTA player, Peng Shuai, are of deep concern.
"As an organisation dedicated to women, we remain committed to the principles we were founded on – equality, opportunity and respect.
"Peng Shuai, and all women, deserve to be heard, not censored. Her accusation about the conduct of a former Chinese leader involving a sexual assault must be treated with the utmost seriousness.
"In all societies, the behaviour she alleges that took place needs to be investigated, not condoned or ignored. We commend Peng Shuai for her remarkable courage and strength in coming forward.
"Women around the world are finding their voices so injustices can be corrected.
"We expect this issue to be handled properly, meaning the allegations must be investigated fully, fairly, transparently and without censorship.
"Our absolute and unwavering priority is the health and safety of our players. We are speaking out so justice can be done."
Osaka's comments follow on from men's world number one Novak Djokovic expressing his concern over the situation when speaking to the media earlier this week.
Djokovic said: "I don't have much information about it. I did hear about it a week ago.
"Honestly, it's shocking that she's missing, more so that it's someone that I have seen on the tour in the previous years quite a few times.
"It's not much more to say than hope that she will be found, that she's OK. It's just terrible. I can imagine just how her family feels that she's missing."
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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