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Juniors

Recognized as young as age 10 as the best in Britain in her age group and training at the national academy, University of Stirling, under coach Toby Smith with mentoring by Judy Murray who said at the time that Lumsden may need to train abroad to realise her potential.

By 2012, she was the No. 1 under-14 player in the Tennis Europe rankings and Under-14 champion at the Junior Orange Bowl beating Gabriella Taylor 6–3, 7–5, in an all-British final. The following year the two players teamed up to become under-16 British National Junior Champions in the doubles whilst Lumsden was also the under-16 singles champion.

Gabi Taylor, Katie Swan, Freya Christie and Lumsden were members of the 2014 British team, coached by Judy Murray, which won the Maureen Connolly Challenge Trophy, an annual under-18s competition against the U.S.

She won an ITF under-18 title in Malta and the Super Open Auray, and reached the third round in the girls’ tournament at Wimbledon.

Lumsden was a member of Great Britain’s University Tennis Team that won a gold medal at the Master’U BNP Paribas Tournament in 2017, and silver medal in 2018.

2012

As a 14 year old, she won her first matches at ITF level beating England's Pippa Horn and Oman's Fatma Al-Nabhani, the second seed and world No. 463, to qualify for the Pro-Series event at Scotstoun.

2017-2018

In 2018, Lumsden's first full year as a professional, she recorded two individual title wins in Sunderland and the Wirral and six ITF doubles finals, three of them as winner.

In 2017, entering her home competition in Scotstoun, Glasgow as a wildcard, Lumsden lost to her Spanish opponent Paula Badosa in the final of the GB Pro-Series Glasgow or Scottish Championships. In November, Lumsden claimed her first $25k title, beating former top 100 player Valeria Savinykh in the final.

2019: WTA Tour singles debut

In February, Lumsden lost at the quarterfinal stage of the $60k Shrewsbury event to top-seeded Yanina Wickmayer.

She made her WTA Tour singles debut at the Nottingham Open in June, after receiving a wildcard to the main draw of the tournament, winning her first match against fellow Brit Tara Moore, then losing the following day to Caroline Garcia.

2023-2024: First Wimbledon doubles quarterfinalist in 40 years, top 70

At the 2023 Wimbledon Championships, she and partner Naiktha Bains became the first British pair to reach the quarterfinals in 40 years.

She made her debut in the top 70 in the doubles rankings on 22 April 2024, following reaching the doubles final of the 2024 Open de Rouen with Naiktha Bains.