Katherine Sebov (born January 5, 1999) is a Canadian professional tennis player. She reached a career-high WTA singles ranking of No. 136, on 10 April 2023.

Early life Sebov was born in Toronto and is of Ukrainian descent.Katherine Sebov bio at WTA Her coaches are Simon Bartram in Toronto and Robert Lansdorp in Los Angeles.

Tennis career 2013–14 Sebov made her professional debut in November 2013 at the $50k Toronto Challenger but was defeated in the qualifying second round in singles and in the first round in doubles. In July 2013, she had won her first junior singles title at the G-4 in Vancouver. In July 2014 at Wimbledon, she qualified for her junior Grand Slam main-draw debut where she lost in the first round in singles and in the quarterfinals in the doubles. In September 2014, Sebov advanced to the third round in singles as a qualifier at the junior US Open and was defeated in the first round in doubles.

2015 In January, Sebov won her second singles junior title, this time at the G-1 in Traralgon. A week later, she reached the second round in singles and the quarterfinals in doubles at the junior event of the Australian Open. In March, she qualified for the main draw of the $25k event in Rancho Santa Fe, but fell in the first round to CiCi Bellis. Sebov made it to the second round in singles and to the first round in doubles at the junior French Open in May. Sebov reached a career-high combined junior ranking of No. 22, achieved on 20 July 2015. In June at the junior competition of Wimbledon, she was eliminated in the first round in singles and in the second in doubles. In July, she qualified for the main draw of the $50k Challenger de Granby , defeating compatriot Catherine Leduc (world No. 155), Julia Glushko, and fellow Canadian Petra Januskova. She was eliminated by Amandine Hesse (No. 224) in the opening round. At the US Open junior singles tournament, she fell in the first round.

2016 At the Australian Open, Sebov advanced to the third round of the junior event in singles but was defeated in the first round in doubles. She decided to focus on the pro circuit for the rest of the season and did not play any other junior tournaments. In May, she reached back-to-back semifinals at $10ks in Antalya. In October, she qualified at the $50k in Saguenay where she was defeated by Sachia Vickery in the second round. Two weeks later in Toronto, she qualified for her second straight $50k main draw, but was once again stopped in the second round, by eventual winner CiCi Bellis.

2017 In January, Sebov qualified and reached the semifinals of the $25k tournament in Orlando. Two weeks later, she qualified for the $100k Midland Classic and defeated world No. 121, Verónica Cepede Royg, in the opening round. She next played Sofya Zhuk and defeated her in straight sets. In the quarterfinals, Sebov scored the biggest win of her career so far with a victory over world No. 97, Varvara Lepchenko, her first top-100 win. She lost to world No. 98, Naomi Broady, in the next round. Sebov was selected to represent Canada at the Fed Cup Americas Zone Group I in early February, along with Bianca Andreescu, Charlotte Robillard-Millette and Carol Zhao, and made her debut with wins over María Fernanda Álvarez Terán of Bolivia, Montserrat González of Paraguay and Bárbara Gatica of Chile. She ended the ties with a 4–0 overall record and helped Canada reach the World Group II Play-offs. In late February, at the $25k event in Rancho Santa Fe, she advanced to the semifinals where she lost to the first seed Kayla Day. In July, she reached her first professional final at the $60k Challenger de Granby but was defeated by Cristiana Ferrando.

2018 In March, at a $25k tournament in Toyota, Sebov reached her second final, losing to Dejana Radanović in three sets.

2021–25: WTA Tour debut, top 150 Sebov made her WTA Tour main-draw debut as a qualifier at the 2021 Chicago Open, losing to Marta Kostyuk in the first round. She made her WTA 1000 debut at the 2022 Canadian Open as a wildcard.

She qualified for her major main-draw debut at the 2023 Australian Open. Ranked No. 172, she made her debut at the 2023 Miami Open also as a qualifier, and defeated Linda Fruhvirtová for her first WTA 1000 and top-50 win, before losing to third seed Jessica Pegula in the second round.

Sebov qualified for the 2025 Charleston Open but was double bageled by Katie Volynets in the first round.

Performance timelines

Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.

Singles Current through the 2023 Charleston Open. Tournament20152016201720182019202020212022202320242025W–LGrand Slam tournaments Australian OpenAAAAQ1AAA1RQ3A0–1 French OpenAAAAAAAAQ1AA0–0 WimbledonAAAAANHAAQ2AA0–0 US OpenAAAAQ1AAAQ1AA0–0Win–loss0–00–00–00–00–00–00–00–00–10–00–00–1WTA 1000Miami OpenAAAAANHAA2RAA1–1Italian OpenAAAAANHAAQ1AA0–0Canadian OpenQ1AQ1Q1Q1NHQ11RQ1Q1Q10–1Career statisticsTournaments000000123Career total: 6Overall win-loss3–00–00–00–10–00–00–11–22–36–7

ITF Circuit finals Singles: 14 (6 titles, 8 runner-ups) LegendW100 tournaments (0–1)W60/75 tournaments (2–3)W25/35 tournaments (4–4)Finals by surfaceHard (6–8) ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 Challenger de Granby, Canada60,000 Hard Cristiana Ferrando 2–6, 3–6Loss 0–2 Mar 2018ITF Toyota, Japan25,000 Hard Dejana Radanović 4–6, 6–3, 4–6Win 1–2 Oct 2018Challenger de Saguenay, Canada60,000 Hard (i) Quirine Lemoine 7–6(10), 7–6(4)Loss 1–3 Jun 2019ITF Figueira da Foz, PortugalW25+H Hard İpek Soylu 7–6(2), 6–7(5), 3–6Loss 1–4 Jul 2019ITF Saskatoon, CanadaW25 Hard Maddison Inglis 4–6, 6–2, 4–6Loss 1-5 Jan 2022ITF Monastir, TunisiaW25 Hard Han Na-lae 3–6, 2–6Loss 1–6 Oct 2022Challenger de Saguenay, CanadaW60 Hard (i) Karman Thandi 6–3, 4–6, 3–6Win 2–6 Dec 2022ITF Tauranga, New ZealandW25 Hard Michaela Bayerlová 6–0, 6–4Win 3–6 Mar 2023ITF Toronto, CanadaW25 Hard (i) Himeno Sakatsume 6–4, 7–6(4)Loss 3–7 Jul 2023Championnats de Granby, CanadaW100 Hard Kayla Day 4–6, 6–2, 5–7 Win 4–7 Oct 2023Challenger de Saguenay, CanadaW60 Hard (i) Fanny Stollár 6–4, 6–4Win 5–7 Jan 2025ITF Naples, United StatesW35 Hard Jessica Pieri 6–2, 6–0Win 6–7 Dec 2025ITF Monastir, TunisiaW35 Hard Nahia Berecoechea 6–4, 6–1Loss 6–8 Apr 2026ITF Calvi, FranceW75 Hard Jeline Vandromme 0–6, 0–6

Doubles: 1 (title) LegendW25 tournaments (1–0)Finals by surfaceCarpet (1–0)

ResultW–LDateTournamentTierPartnerSurfaceOpponentsScoreWin 1–0 Dec 2021ITF Jablonec nad Nisou, Czech RepublicW25 Maja Chwalińska Carpet (i) Lucie Havlíčková Linda Klimovičová 7–5, 6–4

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