2004–2012

Xu made her debut playing on the ITF Women's Circuit in China. She won her first doubles title with Xia Huan in 2006.^[3]

She was a finalist in women's doubles at the 2007 and 2008 China Open in Beijing with Han Xinyun.

2013: Maiden WTA title

2014–2016: Australian Open semifinalist, WTA Elite trophy champion

She was a quarterfinalist at the 2014 US Openin women's doubles with Zarina Diyas.

She reached the semifinals at the 2016 Australian Open and was a quarterfinalist at the 2016 French Open in women's doubles with Zheng Saisai.

2017–2019: Major final and semifinal at Wimbledon, five quarterfinals

She was also a quarterfinalist in doubles at the Australian Open in 2017 with Raquel Atawo. In 2017, she formed a new partnership with Canadian Gabriela Dabrowski. Xu won the Miami Open and the Connecticut Open women's doubles with Dabrowski.^[4] She partnered with Dabrowski again in the US Open, with the pair reaching the quarterfinals.

In 2018, the duo won the doubles competition at the Sydney International,^[5] and then reached the quarterfinals in Melbourne, just like 2019 at the French Open and US Open. The biggest achievement of the Canadian/Chinese pair was reaching the final of the 2019 Wimbledon Championships.

She reached the quarterfinals at the 2018 WTA Finals with Gabriela Dabrowski for a second consecutive year having done so also in 2017. She also qualified for the 2019 WTA Finals for a third year in a row.

2020–2021: US Open and WTA 1000 finals, world No. 7 in doubles, Olympics

She reached the finals of the Western & Southern Open in Cincinnati and the US Open with Nicole Melichar.

In 2021, she competed at the Tokyo Olympics with Yang Zhaoxuan.

2022: Second WTA 1000 title, French Open quarterfinal

In Indian Wells, she won the second WTA 1000 title of her career in doubles, partnering with Yang Zhaoxuan.^[6]

She qualified for her fourth 2022 WTA Finals with a different partner, compatriot Yang Zhaoxuan.^[7]

2023: WTA Elite Trophy

She received a wildcard for the 2023 WTA Elite Trophy in China partnering compatriot Wang Xiyu.

Doubles

Grand Slam tournaments

Doubles: 2 (2 runner-ups)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2019	Wimbledon	Grass	Gabriela Dabrowski	Hsieh Su-wei Barbora Strýcová	2–6, 4–6
Loss	2020	US Open	Hard	Nicole Melichar	Laura Siegemund Vera Zvonareva	4–6, 4–6

Mixed doubles: 1 (runner-up)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2023	Wimbledon	Grass	Joran Vliegen	Lyudmyla Kichenok Mate Pavić	4–6, 7–6(11–9), 3–6

WTA 1000 finals

Doubles: 6 (2 titles, 4 runner-ups)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Win	2017	Miami Open	Hard	Gabriela Dabrowski	Sania Mirza Barbora Strýcová	6–4, 6–3
Loss	2018	China Open	Hard	Gabriela Dabrowski	Andrea Sestini Hlaváčková Barbora Strýcová	6–4, 4–6, [8–10]
Loss	2019	Madrid Open	Clay	Gabriela Dabrowski	Hsieh Su-wei Barbora Strýcová	3–6, 1–6
Loss	2020	Cincinnati Open	Hard	Nicole Melichar	Květa Peschke Demi Schuurs	1–6, 6–4, [4–10]
Loss	2021	Dubai Championships	Hard	Yang Zhaoxuan	Alexa Guarachi Darija Jurak	0–6, 3–6
Win	2022	Indian Wells Open	Hard	Yang Zhaoxuan	Asia Muhammad Ena Shibahara	7–5, 7–6(7–4)

Doubles: 23 (13 titles, 10 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Sep 2007	China Open, China	Tier II	Hard	Han Xinyun	Chuang Chia-jung Hsieh Su-wei	6–7(3–7), 3–6
Loss	0–2	Sep 2008	China Open, China	Tier II	Hard	Han Xinyun	Anabel Medina Garrigues Caroline Wozniacki	1–6, 3–6
Win	1–2	Sep 2013	Korea Open, South Korea	International	Hard	Chan Chin-wei	Raquel Kops-Jones Abigail Spears	7–5, 6–3
Win	2–2	Aug 2015	Silicon Valley Classic, U.S.	Premier	Hard	Zheng Saisai	Anabel Medina Garrigues Arantxa Parra Santonja	6–1, 6–3
Win	3–2	Oct 2015	Tianjin Open, China	International	Hard	Zheng Saisai	Darija Jurak Nicole Melichar	6–2, 3–6, [10–8]
Loss	3–3	Jan 2016	Shenzhen Open, China	International	Hard	Zheng Saisai	Vania King Monica Niculescu	1–6, 4–6
Loss	3–4	Oct 2016	Tianjin Open, China	International	Hard	Magda Linette	Christina McHale Peng Shuai	6–7(8–10), 0–6
Win	4–4	Nov 2016	WTA Elite Trophy, China	Elite	Hard (i)	İpek Soylu	Yang Zhaoxuan You Xiaodi	6–4, 3–6, [10–7]
Win	5–4	Apr 2017	Miami Open, U.S.	Premier M	Hard	Gabriela Dabrowski	Sania Mirza Barbora Strýcová	6–4, 6–3
Win	6–4	Aug 2017	Connecticut Open, U.S.	Premier	Hard	Gabriela Dabrowski	Ashleigh Barty Casey Dellacqua	3–6, 6–3, [10–8]
Win	7–4	Jan 2018	Sydney International, Australia	Premier	Hard	Gabriela Dabrowski	Latisha Chan Andrea Sestini Hlaváčková	6–3, 6–1
Win	8–4	Jun 2018	Eastbourne International, UK	Premier	Grass	Gabriela Dabrowski	Irina-Camelia Begu Mihaela Buzărnescu	6–3, 7–5
Loss	8–5	Oct 2018	China Open, China	Premier M	Hard	Gabriela Dabrowski	Andrea Sestini Hlaváčková Barbora Strýcová	6–4, 4–6, [8–10]
Loss	8–6	May 2019	Madrid Open, Spain	Premier M	Clay	Gabriela Dabrowski	Hsieh Su-wei Barbora Strýcová	3–6, 1–6
Win	9–6	May 2019	Nuremberg Cup, Germany	International	Clay	Gabriela Dabrowski	Sharon Fichman Nicole Melichar	4–6, 7–6(7–5), [10–5]
Loss	9–7	Jul 2019	Wimbledon, UK	Grand Slam	Grass	Gabriela Dabrowski	Hsieh Su-wei Barbora Strýcová	2–6, 4–6
Win	10–7	Jan 2020	Adelaide International, Australia	Premier	Hard	Nicole Melichar	Gabriela Dabrowski Darija Jurak	2–6, 7–5, [10–5]
Loss	10–8	Aug 2020	Cincinnati Open, U.S.	Premier 5	Hard	Nicole Melichar	Květa Peschke Demi Schuurs	1–6, 6–4, [4–10]
Loss	10–9	Sep 2020	US Open, United States	Grand Slam	Hard	Nicole Melichar	Laura Siegemund Vera Zvonareva	4–6, 4–6
Loss	10–10	Mar 2021	Dubai Championships, U.A.E.	WTA 1000	Hard	Yang Zhaoxuan	Alexa Guarachi Darija Jurak	0–6, 3–6
Win	11–10	Mar 2022	Indian Wells Open, U.S.	WTA 1000	Hard	Yang Zhaoxuan	Asia Muhammad Ena Shibahara	7–5, 7–6(7–4)
Win	12–10	Aug 2022	Silicon Valley Classic, U.S. (2)	WTA 500	Hard	Yang Zhaoxuan	Shuko Aoyama Chan Hao-ching	7–5, 6–0
Win	13–10	May 2023	Internationaux de Strasbourg, France	WTA 250	Clay	Yang Zhaoxuan	Desirae Krawczyk Giuliana Olmos	6–3, 6–2

Doubles: 2 (1 title, 1 runner-up)

Result	W–L	Date	Tournament	Surface	Partner	Opponents	Score
Win	1–0	Nov 2013	Nanjing Ladies Open, China	Hard	Misaki Doi	Zhang Shuai Yaroslava Shvedova	6–1, 6–4
Loss	1–1	Jul 2014	Jiangxi International, China	Hard	Chan Chin-wei	Junri Namigata Chuang Chia-jung	6–7(4–7), 3–6

Singles: 6 (1–5)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	May 2007	ITF Chengdu, China	25,000	Hard	Zhang Shuai	2–6, 3–6
Loss	0–2	Apr 2010	ITF Changwon, South Korea	25,000	Hard	Lee Jin-a	6–3, 4–6, 2–6
Loss	0–3	May 2010	ITF Karuizawa, Japan	25,000	Carpet	Natsumi Hamamura	1–6, 2–6
Win	1–3	Apr 2014	ITF Nanning, China	25,000	Hard	Chan Yung-jan	6–3, 7–6(1)
Loss	1–4	Jun 2014	ITF Zhengzhou, China	25,000	Hard	Zhang Kailin	5–7, 4–6
Loss	1–5	Jul 2014	ITF Phuket, Thailand	25,000	Hard (i)	Wang Yafan	6–3, 2–6, 5–7

Doubles: 33 (21–12)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	May 2006	ITF Tarakan, Indonesia	10,000	Hard	Xia Huan	Sandy Gumulya Septi Mende	6–2, 6–7(3), 7–6(5)
Loss	1–1	Jul 2006	ITF Chengdu, China	25,000	Hard	Xia Huan	Ren Jing Zhang Shuai	4–6, 2–6
Loss	1–2	Aug 2006	ITF Changsha, China	25,000	Hard	Xia Huan	Chen Yanchong Liu Wanting	3–6, 3–6
Loss	1–3	May 2007	ITF Chengdu, China	25,000	Hard	Huang Lei	Song Shanshan Xie Yanze	3–6, 5–7
Win	2–3	Jun 2007	ITF Changsha, China	25,000	Hard	Huang Lei	Chan Chin-wei Kumiko Iijima	6–3, 6–4
Win	3–3	Jun 2007	ITF Guangzhou, China	50,000[lower-alpha 1]	Hard	Huang Lei	Chen Yanchong Zhou Yimiao	6–2, 7–6(4)
Loss	3–4	Nov 2007	Anning Open, China	50,000	Hard	Han Xinyun	Urszula Radwańska Yanina Wickmayer	4–6, 1–6
Win	4–4	Dec 2007	ITF Xiamen, China	75,000[lower-alpha 2]	Hard	Han Xinyun	Ji Chunmei Sun Shengnan	6–4, 7–5
Win	5–4	May 2008	ITF Caserta, Italy	25,000	Clay	Han Xinyun	Sophie Ferguson Christina Wheeler	4–6, 6–4, [10–8]
Loss	5–5	Jun 2008	ITF Périgueux, France	25,000	Clay	Han Xinyun	Anna-Lena Grönefeld İpek Şenoğlu	3–6, 4–6
Loss	5–6	Feb 2009	Burnie International, Australia	25,000	Hard	Zhou Yimiao	Monique Adamczak Abigail Spears	2–6, 4–6
Win	6–6	Jun 2009	ITF Komoro, Japan	25,000	Clay	Zhang Shuai	Ayumi Oka Varatchaya Wongteanchai	6–2, 6–1
Win	7–6	Jan 2010	ITF Pingguo, China	25,000	Hard	Chan Chin-wei	Ji Chunmei Liu Wanting	6–3, 6–1
Win	8–6	Feb 2010	ITF Surprise, United States	25,000	Hard	Ji Chunmei	Christina Fusano Courtney Nagle	5–7, 6–2, [10–5]
Win	9–6	Mar 2010	ITF Hammond, United States	25,000	Hard	Zhou Yimiao	Christina Fusano Courtney Nagle	6–2, 6–2
Win	10–6	Mar 2010	ITF Clearwater, United States	25,000	Hard	Zhou Yimiao	Alina Jidkova Laura Siegemund	6–4, 6–4
Win	11–6	May 2010	Kurume Cup, Japan	50,000	Grass	Sun Shengnan	Karolína Plíšková Kristýna Plíšková	6–0, 6–3
Loss	11–7	May 2010	ITF Karuizawa, Japan	25,000	Carpet	Sun Shengnan	Ayumi Oka Akiko Yonemura	6–7(1), 3–6
Win	12–7	Jul 2010	ITF Fuzhou, China	25,000	Hard	Liu Shaozhuo	Kao Shao-yuan Ayaka Maekawa	3–6, 6–1, [10–2]
Loss	12–8	Oct 2011	ITF Kalgoorlie, Australia	25,000	Hard	Zhang Kailin	Casey Dellacqua Olivia Rogowska	1–6, 1–6
Loss	12–9	Apr 2012	ITF Wenshan, China	50,000	Hard	Liu Wanting	Hsieh Shu-ying Hsieh Su-wei	3–6, 2–6
Win	13–9	May 2012	ITF Changwon, South Korea	25,000	Hard	Liu Wanting	Yang Zhaoxuan Zhang Kailin	6–4, 7–5
Win	14–9	May 2012	ITF Gimcheon, South Korea	25,000	Hard	Hu Yueyue	Liang Chen Sun Shengnan	6–0, 3–6, [10–7]
Loss	14–10	Jul 2012	ITF Yakima, United States	50,000	Hard	Zhou Yimiao	Samantha Crawford Madison Keys	3–6, 6–2, 3–6
Win	15–10	Jul 2012	ITF Evansville, United States	10,000	Hard	Duan Yingying	Mallory Burdette Natalie Pluskota	6–2, 6–3
Win	16–10	Jul 2012	Lexington Challenger, United States	50,000	Hard	Shuko Aoyama	Julia Glushko Olivia Rogowska	7–5, 6–7(7), [10–4]
Loss	16–11	Feb 2013	ITF Surprise, United States	25,000	Hard	Emily J. Harman	Samantha Crawford Sachia Vickery	3–6, 6–3, [7–10]
Loss	16–12	May 2013	ITF Balikpapan, Indonesia	25,000	Hard	Chen Yi	Naomi Broady Teodora Mirčić	3–6, 3–6
Win	17–12	Feb 2014	Rancho Santa Fe Open, United States	25,000	Hard	Samantha Crawford	Danielle Lao Keri Wong	3–6, 6–2, [12–10]
Win	18–12	Mar 2014	ITF Quanzhou, China	50,000	Hard	Chan Chin-wei	Sun Ziyue Xu Shilin	7–6(4), 6–1
Win	19–12	Apr 2015	Kangaroo Cup Gifu, Japan	75,000	Hard	Wang Yafan	An-Sophie Mestach Emily Webley-Smith	6–2, 6–3
Win	20–12	May 2015	Anning Open, China	75,000	Hard	Zheng Saisai	Yang Zhaoxuan Ye Qiuyu	7–5, 6–2
Win	21–12	Jun 2015	Ilkley Trophy, United Kingdom	50,000	Grass	Raluca Olaru	An-Sophie Mestach Demi Schuurs	6–3, 6–4