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. In June at the junior competition of
Wimbledon, she 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
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. 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, 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. 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==