In June 2022, Xu won the Junior Girls title at the LTA Junior National Championships, beating Talia Neilson-Gatenby in the final at the National Tennis Centre.[9] Aged 14, she had also won the under-16 British title earlier that same month.[10] Winning the British junior title granted her a wildcard into qualifying for the main draw of the 2022 Wimbledon Championships, where she was defeated by 800+ places higher-ranked Hanna Chang of the USA in the first round.[11] In the Wimbledon Championships junior girls' singles competition, she reached the last-16 in both 2022 and 2023. She also made the doubles quarterfinals at the French Open and US Open in 2023.[8]
She reached the quarterfinals of the girls' singles at the 2024 Australian Open,[12] and made the semifinals of the girls' doubles alongside Hannah Klugman.[13]
In April 2024, Xu and Mika Stojsavljevic paired up to defeat Flora Johnson and Allegra Korpanec Davies in the girls' doubles at the Under 18s Junior Nationals Championship. On the same day, she defeated Stojsavljevic to reach the final of the girls' singles which she won against Hannah Klugman.[14] In June 2024, she was awarded a wildcard into qualifying for the singles of the 2024 Wimbledon Championships.[15] As a result, she broke into the top 10 of the junior rankings for the first time.[16]
Playing alongside Stojsavljevic, she reached the final of the girls' doubles at the 2024 Wimbledon Championships, after a win over top seeds and defending champions, Alena Kovačková and Laura Samson, in the quarterfinals and a straight-sets win over Julia Stusek and Julie Pastioka in the semifinals.[17][18] In the final, they lost on a championship tiebreak to Tyra Caterina Grant and Iva Jovic of the United States.[17] She reached the semifinals of the girls' singles at the 2024 US Open.[19]
Partnering with Amelia Rajecki, Xu won the doubles title at the W100 Shrewsbury in October 2024, defeating fellow Britons Hannah Klugman and Ranah Stoiber in the final.[20]
In June 2025, she received a wildcard to make her WTA 125 debut at the Birmingham Open and defeated top seed, world No. 52 Alycia Parks, in the first round.[21][22] Xu then overcame Katarzyna Kawa in three sets to reach the quarterfinals.[23][24] She lost to Jessika Ponchet in the last eight.[25] Two weeks later, again as a wildcard entrant, Xu made her WTA Tour main-draw debut at the Nottingham Open, defeating world No. 96 Katie Volynets in the first round,[26] before losing to sixth seed Magda Linette in her next match.[27] Xu was awarded a wildcard to make her major tournament main-draw debut at Wimbledon.[28] She lost in the first round to fellow Briton Emma Raducanu.[29]
On 26 October 2025, Xu won both singles and doubles titles at the 2025 Wrexham Open, defeating Mika Stojsavljevic in straight sets in the singles final and winning the doubles title alongside Ella McDonald.[30]
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Great Britain
Haley Giavara
Radka Zelníčková
Elena Milovanović 
Tamira Paszek
Punnin Kovapitukted 
Akiko Omae
Ekaterina Ovcharenko 
Vendula Valdmannová
Valentina Ryser