Katherine Sebov

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.^[5] In July 2013, she had won her first junior singles title at the G-4 in Vancouver.^[6] 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.^[7] 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.^[8]

2015

In January, Sebov won her second singles junior title, this time at the G-1 in Traralgon.^[9] A week later, she reached the second round in singles and the quarterfinals in doubles at the junior event of the Australian Open.^[10] 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.^[11] Sebov made it to the second round in singles and to the first round in doubles at the junior French Open in May.^[12] In June at the junior competition of Wimbledon, she was eliminated in the first round in singles and in the second round in doubles.^[13] In July, she qualified for the main draw of the $50k Granby Challenger, 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.^[14] At the US Open junior singles tournament, she fell in the first round.^[15]

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.^[16] 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.^[17][18] In October, she qualified at the $50k in Saguenay where she was defeated by Sachia Vickery in the second round.^[19] 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.^[20]

2017

In January, Sebov qualified and reached the semifinals of the $25k tournament in Orlando.^[21] 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.^[22] 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.^[23] 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.^[24] In July, she reached her first professional final at the $60k Challenger de Granby but was defeated by Cristiana Ferrando.^[25]

2018

In March, at a $25k tournament in Toyota, Sebov reached her second final, losing to Dejana Radanović in three sets.^[26]

2021–25: WTA Tour, Grand Slam tournament & top 150 debuts

Sebov made her WTA Tour main-draw debut as a qualifier at the 2021 Chicago Open, losing to Marta Kostyuk in the first round.^[27] She made her WTA 1000 debut at the 2022 Canadian Open as a wildcard.^{[citation needed]}

She qualified for her major main-draw debut at the 2023 Australian Open.^[28][29] 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,^[30] before losing to third seed Jessica Pegula in the second round.^[31]

Sebov qualified for the 2025 Charleston Open but was double bageled by Katie Volynets in the first round.^[32]

Singles

Current through the 2023 Charleston Open.

Singles: 13 (6 titles, 7 runner-ups)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jul 2017	Challenger de Granby, Canada	60,000	Hard	Cristiana Ferrando	2–6, 3–6
Loss	0–2	Mar 2018	ITF Toyota, Japan	25,000	Hard	Dejana Radanović	4–6, 6–3, 4–6
Win	1–2	Oct 2018	Challenger de Saguenay, Canada	60,000	Hard (i)	Quirine Lemoine	7–6(10), 7–6(4)
Loss	1–3	Jun 2019	ITF Figueira da Foz, Portugal	W25+H	Hard	İpek Soylu	7–6(2), 6–7(5), 3–6
Loss	1–4	Jul 2019	ITF Saskatoon, Canada	W25	Hard	Maddison Inglis	4–6, 6–2, 4–6
Loss	1-5	Jan 2022	ITF Monastir, Tunisia	W25	Hard	Han Na-lae	3–6, 2–6
Loss	1–6	Oct 2022	Challenger de Saguenay, Canada	W60	Hard (i)	Karman Thandi	6–3, 4–6, 3–6
Win	2–6	Dec 2022	ITF Tauranga, New Zealand	W25	Hard	Michaela Bayerlová	6–0, 6–4
Win	3–6	Mar 2023	ITF Toronto, Canada	W25	Hard (i)	Himeno Sakatsume	6–4, 7–6(4)
Loss	3–7	Jul 2023	Championnats de Granby, Canada	W100	Hard	Kayla Day	4–6, 6–2, 5–7
Win	4–7	Oct 2023	Challenger de Saguenay, Canada	W60	Hard (i)	Fanny Stollár	6–4, 6–4
Win	5–7	Jan 2025	Naples Women's World Tennis Tour, United States	W35	Hard	Jessica Pieri	6–2, 6–0
Win	6–7	Dec 2025	ITF Monastir, Tunisia	W35	Hard	Nahia Berecoechea	6–4, 6–1

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Doubles: 1 (title)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Partner	Surface	Opponents	Score
Win	1–0	Dec 2021	ITF Jablonec nad Nisou, Czech Republic	W25	Carpet (i)	Maja Chwalińska	Lucie Havlíčková Linda Klimovičová	7–5, 6–4

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