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Sun Xinran: The Rising Sun Lost Two Grand Slam Finals, Then She Started Winning

By: Jun Pasion |
 October 3, 2026

At 16 years old, Sun Xinran has her first completed WTA Tour victory—and it came against a seeded Top-40 opponent at the China Open.

The Chinese wild card defeated No. 27 seed Cristina Bucsa 6–4, 7–5 in Beijing, following an opening round in which Sun led Eva Lys 6–1, 3–0 before Lys retired with a foot injury.

Sun is now into the third round.

Waiting there is No. 3 seed Coco Gauff.

It would be easy to look at that matchup and make this story about Gauff.

It isn’t.

Because Sun’s arrival in Beijing started long before Beijing.

She reached three consecutive junior Grand Slam finals this year.

She lost the first.

She lost the second.

Then she won the third.

And now the junior World No. 1 is beginning to find out what that game can do against established professionals.

Two Grand Slam Finals, Two Defeats

Sun’s 2026 junior season could easily have been remembered for how close she came.

At Roland Garros, she reached the girls’ singles final and finished runner-up.

Then came Wimbledon.

Another Grand Slam.

Another final.

Another defeat.

This time, Anna Pushkareva beat her for the title.

Three consecutive junior majors had given Sun two opportunities to become a Grand Slam champion.

Both had ended one match short.

There was still one major left.

Third Time Was the Charm

At the US Open, Sun reached another final.

And Pushkareva was waiting again.

This time, the result changed.

Sun defeated her 6–4, 4–6, 6–0 to win the 2026 US Open girls’ singles championship.

Three consecutive Grand Slam finals:

Roland Garros — Runner-up
Wimbledon — Runner-up
US Open — Champion

It wasn’t simply Sun’s first junior major title.

She became the first Chinese junior Grand Slam singles champion since Wang Xiyu won the US Open girls’ title in 2018.

By this point, the résumé was beginning to look considerably larger than one trophy.

The Junior World No. 1 Had Already Been Winning

Sun arrived in Beijing as the junior World No. 1.

She is only the third Chinese girl to reach that position, following Xu Shilin in 2014 and Wang Xiyu in 2018.

There were other markers.

Sun won the Orange Bowl/Fort Lauderdale J500 in December 2025 and the Trofeo Bonfiglio in Milan in May 2026, becoming the first Chinese player—boy or girl—to win two J500 singles titles.

And she had already begun testing herself beyond juniors.

Sun won back-to-back W15 Sharm El Sheikh titles in late 2025 and recorded her first Top-200 victory over Lina Gjorcheska at the Istanbul WTA 125 in May 2026.

So Beijing didn’t create the prospect.

It gave us another measurement of her development.

From Shenzhen to Serbia

Sun was born on July 23, 2010, and comes from Shenzhen, China.

She began playing tennis at five.

Her development eventually took her much farther from home: Sun relocated to Belgrade, Serbia, at age 10 and trains at Tennis Park Belgrade under coaches Goran Zivotic and Goran Krivokuca.

She plays right-handed, prefers hard courts and entered Beijing ranked No. 582, with a career high of No. 574 reached on September 21.

Among the players she has identified as idols are Zheng Qinwen and Rafael Nadal.

The junior ranking tells us where she stands among players her age.

Beijing is beginning to show us something different.

Nine Straight Games Announced Her Arrival

Sun’s first China Open match came against Eva Lys.

She lost her opening service game.

Then she won nine consecutive games.

Sun led 6–1, 3–0 when Lys retired because of a foot injury.

That distinction matters.

It was not a completed straight-set victory, and it shouldn’t be presented as one.

But what happened before the retirement provided an intriguing glimpse of Sun’s game.

In one sequence, she finished a 22-shot rally with a drop-shot winner.

In another, she ended a 23-shot rally with a backhand winner.

Power was there.

So was variation.

Still, Sun needed a completed WTA result before Beijing could tell us much more.

Two days later, she got one.

Then She Beat Cristina Bucsa

Cristina Bucsa entered their second-round match as the No. 27 seed and a player ranked around World No. 35.

Sun entered ranked outside the Top 500.

The 16-year-old won 6–4, 7–5.

This time there was no retirement.

Sun had her first completed WTA Tour victory—and her first win over a seeded player at this level.

The numbers provide a little more detail.

She won 72% of her first-serve points, saved three of five break points and converted four of her five opportunities.

They also show why this story shouldn’t become a coronation.

Sun landed only 49% of her first serves and committed four double faults.

There is power to develop.

There are weaknesses to develop too.

She’s 16.

That’s rather the point.

A Chinese Junior Pathway — Not a Prediction

There is an interesting connection running through Sun’s story.

The last Chinese player before her to win a junior Grand Slam singles title was Wang Xiyu, champion at the 2018 US Open.

Wang also recently defeated Alex Eala 3–6, 6–3, 6–2 in the 2026 Asian Games semifinal.

That makes the connection timely for Tennis Roundup readers following Asian tennis.

But it isn’t a career prediction.

Wang and Sun are different players developing on different paths.

Junior success creates opportunities.

It doesn’t tell us exactly what comes next.

Now Comes Coco Gauff

What comes next in Beijing, however, is already known.

Coco Gauff.

Sun’s third-round opponent is the No. 3 seed, a Grand Slam champion and former Beijing winner.

That’s a substantial jump from Bucsa.

And it is precisely why we don’t need to predict what Sun Xinran will become.

Beijing hasn’t answered how far she can go.

What it has answered is an earlier question:

Is the best junior in the world ready to begin testing herself against established professionals?

Cristina Bucsa supplied the first completed answer.

Coco Gauff makes the examination harder.

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