31/08/2026 Dart came from a set down to beat American Peyton Stearns at the US Open, advancing to the second round after a long three-set match. She had qualified for the main draw by beating compatriot Heather Watson in the final qualifying round. The win ended a 19-month wait for a Grand Slam main-draw victory.
21/06/2026 Dart and Maia Lumsden won the women's doubles title at the Lexus Nottingham Open, a WTA 250 grass-court event. It was their first WTA Tour-level title together.
01/02/2026 Dart reached the singles final of the 2026 ITF Fujairah Championships in the United Arab Emirates. She lost 6-4, 6-2 to Austria's Lilli Tagger, while she and Lumsden won the doubles title.
29/09/2025 Dart won the W35 Monastir singles title after a run that included a semi-final against British teenager Mika Stojsavljevic and a three-set final against Switzerland’s Alina Grandwehr. The victory was described as her first ITF singles title of the year and the sixth singles title of her career.
16/04/2025 Harriet Dart apologised after telling her French opponent Lois Boisson during a match that she smelled bad and should use deodorant. She later posted a public apology on Instagram, saying the comment was made in the heat of the moment and did not reflect how she wants to carry herself.
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