Anna Klasen (born 15 November 1993) is a German tennis player.

Klasen has a career-high singles ranking by the Women's Tennis Association (WTA) of world No. 426, achieved on 6 April 2015, and a doubles ranking of No. 341, achieved on 19 September 2016. She has won two singles titles and 15 doubles titles on the ITF Circuit. Her younger sister Charlotte Klasen was also a professional tennis player.

Klasen made her WTA Tour main-draw debut at the 2022 Hamburg European Open in the doubles draw, partnering Tamara Korpatsch.

ITF Circuit finals Singles: 5 (2 titles, 3 runner–ups) Legend$25,000 tournaments (0–1)$10,000 tournaments (2–2) ResultW–LDateTournamentTierSurfaceOpponentScoreWin1–0ITF Brussels, Belgium10,000Clay Eugeniya Pashkova6–3, 6–3Loss1–1ITF Pula, Italy10,000Clay Ilka Csöregi6–7(4), 6–7(3)Loss1–2ITF Pula, Italy10,000Clay Corinna Dentoni3–6, 3–6Win2–2ITF Sousse, Tunisia10,000Hard Mandy Wagemaker4–6, 7–5, 6–4Loss2–3ITF Braunschweig, Germany25,000Clay Nastasja Schunk3–6, 1–6

Doubles: 26 (15 titles, 11 runner–ups) Legend$25,000 tournaments (2–2)$10/15,000 tournaments (13–9) ResultW–LDateTournamentTierSurfacePartnerOpponents ScoreLoss 0–1 ITF Šibenik, Croatia10,000 Clay Cindy Burger Barbora Krejčíková Polina Leykina 6–3, 3–6, [10–12]Win 1–1 ITF Brussels, Belgium10,000 Clay Charlotte Klasen Michaela Boev Anastasiya Vasylyeva 6–1, 6–3Win 2–1 ITF Ratingen, Germany10,000 Clay Carolin Daniels Bernice van de Velde Karolina Wlodarczak 7–5, 6–2Win 3–1 ITF Antalya, Turkey10,000 Clay Lena-Marie Hofmann Kamonwan Buayam Barbora Štefková 6–2, 6–2Win 4–1 ITF Antalya, Turkey10,000 Clay Charlotte Klasen Asiya Dair Lee Hua-chen 7–6(2), 6–2Win 5–1 ITF Castellón, Spain10,000 Clay Martina Colmegna Lucía Cervera Vázquez Zhu Aiwen 6–1, 5–7, [10–5]Loss 5–2 ITF Bron, France10,000 Hard (i) Katharina Lehnert Alyona Sotnikova Isabella Shinikova 7–5, 6–7(5), [5–10]Loss 5–3 ITF Bol, Croatia10,000 Clay Charlotte Klasen Justine De Sutter Sofie Oyen 6–3, 6–7(4), [7–10]Win 6–3 ITF Pula, Italy10,000 Clay Charlotte Klasen Marie Benoît Kimberley Zimmermann 6–3, 4–6, [10–8]Loss 6–4 ITF Pula, Italy10,000 Clay Charlotte Klasen Lisa Sabino Anne Schäfer 4–6, 7–5, [6–10]Win 7–4 ITF Pula, Italy10,000 Clay Charlotte Klasen Diana Enache Raluca Elena Platon 6–2, 6–3Loss 7–5 ITF Velenje, Slovenia10,000 Clay Yvonne Neuwirth Nina Potočnik Natalija Šipek 6–4, 3–6, [4–10]Loss 7–6 ITF Alkmaar, Netherlands10,000 Clay Charlotte Klasen Sally Peers Sandra Zaniewska 3–6, 4–6Loss 7–7 ITF Sozopol, Bulgaria10,000 Hard Charlotte Klasen Isabella Shinikova Julia Terziyska 2–6, 1–6Win 8–7 ITF Antalya, Turkey10,000 Hard Charlotte Klasen Anna Bondár Rebeka Stolmár 6–4, 6–4Win 9–7 ITF Leipzig, Germany25,000 Clay Nicola Geuer Michaela Hončová Olga Ianchuk 7–6(4), 7–5Win 10–7 ITF Stockholm, Sweden10,000 Hard (i) Laura Ioana Paar Mirjam Björklund Brenda Njuki 6–2, 6–2Loss 10–8 ITF Óbidos, Portugal15,000 Carpet Erika Vogelsang Manisha Foster Hélène Scholsen 6–7(6), 1–6Win 11–8 ITF Óbidos, Portugal15,000 Carpet Erika Vogelsang Olivia Nicholls Laura Sainsbury 6–3, 4–6, [10–6]Loss 11–9 ITF Solarino, Italy15,000 Carpet Romy Koelzer Quinn Gleason Sviatlana Pirazhenka 4–6, 4–6Win 12–9 ITF Oeiras, Portugal15,000 Clay Romy Koelzer Alba Carrillo Marín Claudia Cianci 6–3, 6–3Win 13–9 ITF Kaltenkirchen, Germany15,000 Clay Gabriella Da Silva-Fick Albina Khabibulina Oana Georgeta Simion 6–4, 7–5Loss 13–10 ITF Den Haag, Netherlands25,000 Clay Gabriella Da Silva-Fick Valentini Grammatikopoulou Quirine Lemoine 2–6, 7–5, [3–10]Win 14–10 ITF Helsingborg, Sweden15,000 Hard (i) Phillippa Preugschat Tatiana Barkova Natália Szabanin 1–6, 6–3, [11–9]Win 15–10 ITF Braunschweig, Germany25,000 Clay Martina Colmegna Veronika Erjavec Weronika Falkowska 6–3, 2–6, [10–5]Loss 15–11 ITF Helsinki, Finland25,000 Hard (i) Eliessa Vanlangendonck Katarina Jokić Taylor Ng 6–3, 2–6, [7–10]

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