Back Da-yeon (born 24 January 2002) is a Korean tennis player. She has a career-high singles ranking of 245 by the WTA, achieved on 27 July 2026, and a best doubles ranking of No. 234, reached on 20 July 2026. She has won twelve singles titles and 15 doubles titles on the ITF Circuit.

Career Back made her WTA Tour debut at the 2022 Korea Open, after qualifying for the singles main draw. She lost in the first round to fellow South Korean player Han Na-lae.

She was a winner of the Heart Award in the 2023 Billie Jean King Cup.

Ranked No. 569, she received a wildcard from the 2023 Korea Open and upset second seed Jelena Ostapenko in the champion's tie-break having fought back from match point down earlier in the third set. before losing in the next round to Kimberly Birrell.

Given a wildcard for the newly upgraded WTA 500 Korea Open in 2024, she tried to defend her success of the previous year, but went out in the first round, in straight sets to qualifier Carol Zhao.

ITF Circuit finals Singles: 21 (12 titles, 9 runner-ups) LegendW50 tournaments (0–1)W35 tournaments (5–2)W15 tournaments (7–6)Finals by surfaceHard (12–7)Clay (0–1)Carpet (0–1) ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 Sep 2019ITF Yeongwol, South KoreaW15 Hard Choi Ji-hee 7–5, 3–6, 2–6Win 1–1 Sep 2022ITF Yeongwol, South KoreaW15 Hard Kim Da-bin 7–6(2), 3–0 ret.Loss 1–2 Jul 2023ITF Nakhon, ThailandW15 Hard Lanlana Tararudee 4–6, 4–6Win 2–2 Aug 2023ITF Sapporo, JapanW15 Hard Miho Kuramochi 6–2, 6–0Win 3–2 Sep 2023ITF Yeongwol, South KoreaW15 Hard Dasha Ivanova 6–3, 6–0Loss 3–3 Sep 2023ITF Yeongwol, South KoreaW15 Hard Kim Da-bin 2–6, 1–6Loss 3–4 May 2024ITF Monastir, TunisiaW15 Hard Mariia Tkacheva 4–6, 3–6Win 4–4 May 2024ITF Monastir, TunisiaW15 Hard Katarína Kužmová 6–3, 6–0Win 5–4 Jun 2024ITF Daegu, South KoreaW35 Hard Eri Shimizu 4–6, 6–2, 6–3Win 6–4 Sep 2024ITF Yeongwol, South KoreaW15 Hard Lee Eun-hye 6–2, 6–1Win 7–4 Sep 2024ITF Yeongwol, South KoreaW15 Hard Jeong Bo-young 6–1, 6–2Loss 7–5 Mar 2025ITF Nonthaburi, ThailandW35 Hard Lee Eun-hye 3–6, 4–6Loss 7–6 Mar 2025ITF Nonthaburi, ThailandW15 Hard Anchisa Chanta 6–7((3), 3–6Win 8–6 May 2025ITF Daegu, South KoreaW15 Hard Lee Eun-hye 5–6 ret.Win 9–6 Jul 2025ITF Monastir, TunisiaW35 Hard Arianna Zucchini 6–7(4), 6–2, 7–6(7)Loss 9–7 Oct 2025ITF Makinohara, JapanW35 Carpet Sara Saito 1–6, 2–6Loss 9–8 Apr 2026ITF Singapore, SingaporeW15 Hard (i) Rinko Matsuda 6–7(4), 2–6Win 10–8 May 2026ITF Andong, South KoreaW35 Hard Jeong Bo-young 3–6, 6–2, 6–0Win 11–8 May 2026ITF Changwon, South KoreaW35 Hard Lee Ha-eum 6–1, 6–2Win 12–8Jun 2026ITF Taipei, Chinese Taipei W35Hard Haruka Kaji6–1, 7–5Loss 12–9Jul 2026ITF Horb, GermanyW50Clay Lea Nilsson6–7(3), 2–6

Doubles: 26 (15 titles, 11 runner-ups) LegendW75 tournaments (0–1)W50 tournaments (0–1)W35 tournaments (8–1)W15 tournaments (7–8)Finals by surfaceHard (13–9)Clay (2–2) ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreWin 1–0 Oct 2021ITF Antalya, TurkeyW15 Clay Tian Fangran Doğa Türkmen Melis Ayda Uyar 7–6(5), 6–1Loss 1–1 Nov 2021ITF Antalya, TurkeyW15 Clay Tian Fangran Ksenia Laskutova Aleksandra Pospelova 6–2, 2–6, [6–10]Win 2–1 Nov 2021ITF Antalya, TurkeyW15 Clay Tian Fangran Anna Chekanskaya Zoziya Kardava 7–5, 6–3Loss 2–2 Jul 2022ITF Monastir, TunisiaW15 Hard Jeong Bo-young Priska Madelyn Nugroho Wei Sijia 4–6, 1–6Win 3–2 Sep 2022ITF Yeongwol, South KoreaW15 Hard Lee Eun-hye Junri Namigata Riko Sawayanagi 7–5, 3–6, [13–11]Loss 3–3 Sep 2022ITF Yeongwol, South KoreaW15 Hard Lee Eun-hye Kim Da-bin Lee So-ra 4–6, 6–3, [10–12]Loss 3–4 Mar 2023ITF Sharm El Sheikh, EgyptW15 Hard Jeong Bo-young Polina Iatcenko Sandra Samir 4–6, 5–7Loss 3–5 Aug 2023ITF Sapporo, JapanW15 Hard Jeong Bo-young Mushika Mao Himari Satō 3–6, 4–6Loss 3–6 Aug 2023ITF Sapporo, JapanW15 Hard Jeong Bo-young Nana Kawagishi Kisa Yoshioka 3–6, 3–6Loss 3–7 Sep 2023ITF Yeongwol, South KoreaW15 Hard Jeong Bo-young Kim Da-bin Kim Na-ri 2–6, 3–6Win 4–7 May 2024ITF Monastir, TunisiaW15 Hard María Herazo González Natsuho Arakawa Zhang Ying 6–4, 6–4Loss 4–8 Jul 2024ITF Ust-Kamenogorsk, KazakhstanW15 Hard Ayumi Koshiishi Aglaya Fedorova Daria Khomutsianskaya 6–7(4), 2–6Win 5–8 Aug 2024ITF Ust-Kamenogorsk, KazakhstanW15 Hard Anastasia Sukhotina Varvara Panshina Daria Shubina 6–3, 6–1Win 6–8 Sep 2024ITF Yeongwol, South KoreaW15 Hard Lee Eun-hye Kim Na-ri Ye Qiuyu 6–1, 6–1Win 7–8 Feb 2025ITF Timaru, New ZealandW35 Hard Lee Eun-hye Choi On-yu Nanari Katsumi 7–5, 6–3Win 8–8 May 2025ITF Andong, South KoreaW35 Hard Lee Eun-hye Han Hyeong-ju Kim Eun-chae 3–6, 6–2, [10–4]Win 9–8 May 2025ITF Daegu, South KoreaW15 Hard Lee Eun-hye Kim Da-bin Ku Yeon-woo 6–1, 6–1Win 10–8 Jul 2025ITF Monastir, TunisiaW35 Hard Ku Yeon-woo Sakura Hosogi Misaki Matsuda 6–3, 6–3Loss 10–9 Jul 2025ITF Monastir, TunisiaW35 Hard Vaidehi Chaudhari Tenika McGiffin Elza Tomase 6–3, 3–6, [8–10]Loss 10–10 Nov 2025ITF Playford, AustraliaW75 Hard Lee Eun-hye Talia Gibson Maddison Inglis 2–6, 0–6Win 11–10 Feb 2026ITF Monastir, TunisiaW35 Hard Sapfo Sakellaridi Alina Yuneva Daria Egorova 6–3, 6–2Win 12–10 Apr 2026ITF Goyang, South KoreaW35 Hard Jaeda Daniel Kim Da-bin Park So-hyun 6–4, 6–0Win 13–10 May 2026ITF Changwon, South KoreaW35 Hard Guo Meiqi Hanna Chang Jang Ga-eul 7–5, 7–5 Win 14–10 May 2026ITF Andong, South KoreaW35 Hard Jang Su-jeong Jeong Bo-young Park So-hyun 6–4, 6–3Win 15–10 Jun 2026ITF Taipei, Chinese TaipeiW35 Hard Tsao Chia-yi Natsumi Kawaguchi Ayano Shimizu 7–5, 6–1Loss15–11Jul 2026ITF Horb, GermanyW50Clay Park So-hyun Sapfo Sakellaridi Lucie Nguyen Tan2–6, 6–2, [7–10]

Billie Jean King Cup participation Singles (10–3) EditionRoundLocationDateAgainstOpponentW/LScore 2023 BJK Cup Asia/Oceania Zone Tashkent, Uzbekistan 12 April 2023 China Wushuang ZhengW6–3, 6–414 April 2023 Uzbekistan Sevil YuldashevaW6–2, 6–3 2024 Billie Jean King Cup play-offs Zarina DiyasL6–3, 3–6,(1)6–7 2024 BJK Cup Astana, Kazakhstan 9 February 2024 Kazakhstan

Top 5 highest rank wins #TournamentCategoryStart dateSurfaceOpponentRankScore1Korea Open, South KoreaWTA 2509 October 2023Hard1R Jeļena Ostapenko No. 133–6, 6–1, 7–6(4)No. 5692Korea Open, South KoreaWTA 25019 September 2022HardQ1 Lina Glushko No. 2187–5, 1–6, 6–1No. 6793Incheon Open, South KoreaITF W1002 September 2024Hard1R Ma Yexin No. 2236–4, 6–3No. 3444Gold Coast Tennis International, AustraliaITF W60 27 November 2023 Hard1R Seone Mendez No. 2346–3, 6–3 No. 4805ITF Andong, South KoreaITF W3516 May 2026HardSF Sofya Lansere No. 2686–3, 6–1No. 332

statistics correct .

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