|Born||January 5, 1999|
|Height||1.73 m (5 ft 8 in)|
|Plays||Right-handed (two-handed backhand)|
|Career record||151-105 (59.0%)|
|Career titles||1 ITF|
|Highest ranking||No. 192 (October 21, 2019)|
|Current ranking||No. 261 (March 22, 2021)|
|Grand Slam Singles results|
|Australian Open||Q1 (2019)|
|US Open||Q1 (2019)|
|Career record||12-20 (37.5%)|
|Highest ranking||No. 433 (May 27, 2019)|
|Current ranking||No. 798 (March 22, 2021)|
|Last updated on: April 2, 2021.|
Katherine Sebov (born January 5, 1999) is a Canadian professional tennis player. She reached a career-high WTA singles ranking of No. 192, on 21 October 2019, and a career-high ITF junior ranking of No. 22, on 20 July 2015.
Sebov made her professional debut in November 2013 at the ITF $50k event in Toronto, but was defeated in the qualifying second round in singles and in the first round in doubles. In July 2013, she won her first junior singles title at the G4 in Vancouver. In July 2014 at Wimbledon, she qualified for her first junior Grand Slam main draw where she lost in the first round in singles and in the quarterfinals in 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.
In January, Sebov won her second singles junior title, this time at the G1 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, Sebov qualified for the $25k main draw 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. In June at the junior competition of Wimbledon, Sebov was eliminated in the first round in singles and in the second round in doubles. In July, she qualified for the main draw of the $50k event in Granby, defeating respectively compatriot Catherine Leduc, world No. 155, Julia Glushko, and fellow Canadian Petra Januskova. She was eliminated by world No. 224, Amandine Hesse, in the opening round. In September at the US Open junior tournament, she fell in the first round in singles.
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, Sebov 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.
In January, Sebov qualified and reached the semifinals of the $25k tournament in Orlando. Two weeks later, she qualified for the $100k in Midland 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 playoffs. In late February, at the $25k 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 in Granby but was defeated by Cristiana Ferrando.
|$100,000 tournaments (0-0)|
|$80,000 tournaments (0-0)|
|$60,000 tournaments (1-1)|
|$25,000 tournaments (0-2)|
|$15,000 tournaments (0-0)|
|Loss||0-1||Jul 2017||ITF Granby, Canada||60,000||Hard||Cristiana Ferrando||2-6, 3-6|
|Loss||0-2||Mar 2018||ITF Toyota, Japan||25,000||Hard||Dejana Radanovi?||4-6, 6-3, 4-6|
|Win||1-2||Oct 2018||ITF Saguenay, Canada||60,000||Hard (i)||Quirine Lemoine||7-6(10), 7-6(4)|
|Loss||1-3||Jun 2019||ITF Figueira Da Foz, Portugal||25,000+H||Hard||?pek Soylu||7-6(2), 6-7(5), 3-6|
|Loss||1-4||Jul 2019||ITF Saskatoon, Canada||25,000||Hard||Maddison Inglis||4-6, 6-2, 4-6|
|Australian Open||A||A||A||A||Q1||A||A||0 / 0||0-0||-|
|French Open||A||A||A||A||A||A||0 / 0||0-0||-|
|Wimbledon||A||A||A||A||A||NH||0 / 0||0-0||-|
|US Open||A||A||A||A||Q1||A||0 / 0||0-0||-|
|Win-Loss||0-0||0-0||0-0||0-0||0-0||0-0||0-0||0 / 0||0-0||-|
|Canadian Open||Q1||A||A||Q1||Q1||NH||0 / 0||0-0||0%|
Sebov's win-loss record (1-3, 25%) against players who were ranked world No. 100 or higher when played is as follows: