2023 National Bank Open – Women's singles

Jessica Pegula defeated Liudmila Samsonova in the final, 6–1, 6–0 to win the women's singles title at the 2023 Canadian Open. It was her second WTA 1000 title. Due to rain, Samsonova had to play two matches (third round and quarterfinals) on Friday and two matches again (semifinals and final) on Sunday; she only had a two-hour break between the semifinal and final match. Pegula, on the other hand, played one match each day of the tournament from Wednesday through Sunday.

Simona Halep was the reigning champion, but could not defend her title due to a provisional suspension for violations of anti-doping rules.

Iga Świątek and Aryna Sabalenka were in contention for the WTA No. 1 ranking. Świątek retained the top ranking by reaching the quarterfinals.

This tournament marked the return to professional competition of former No. 1 player Caroline Wozniacki, who previously retired from the sport in 2020. She lost to reigning Wimbledon champion Markéta Vondroušová in the second round.

Seeds
The top eight seeds received a bye into the second round. • 🇵🇱 Iga Świątek (semifinals)

• Aryna Sabalenka (third round)

• 🇰🇿 Elena Rybakina (semifinals)

• 🇺🇸 Jessica Pegula (champion)

• 🇫🇷 Caroline Garcia (second round)

• 🇺🇸 Coco Gauff (quarterfinals)

• 🇨🇿 Petra Kvitová (third round)

• Maria Sakkari (second round)

• 🇨🇿 Markéta Vondroušová (third round)

• Daria Kasatkina (quarterfinals)

• 🇧🇷 Beatriz Haddad Maia (second round)

• Belinda Bencic (quarterfinals)

• 🇺🇸 Madison Keys (second round, withdrew)

• 🇨🇿 Karolína Muchová (third round)

• Liudmila Samsonova (final)

• Victoria Azarenka (second round, withdrew)

Seeded players
The following are the seeded players. Seedings are based on WTA rankings as of 31 July 2023. Rank and points before are as of 7 August 2023.

The event is not mandatory on the women's side and points from the 2022 tournament are included in the table below only if they counted towards the player's ranking as of 7 August 2023. For other players, the points defending column shows the player's 16th best result.

Points defending will be replaced at the end of the tournament by the highest of (a) the player's points from the 2023 tournament, (b) her 17th best result, or (c) points from her second-highest non-mandatory WTA 1000 event.

† Points from the player's 16th best result (for points defending) or 17th best result (for points earned), in each case as of 7 August 2023. ‡ The player is defending points from a WTA 125 tournament (Concord). § No change in points because points from this tournament did not count as one of the player's 16 best results.

Withdrawn players
The following players would have been seeded, but withdrew before the tournament began. † Points from the player's 16th best result. § No change in points because the player's result from the 2022 tournament did not count towards her ranking as of 7 August 2023.

Wild cards
• 🇨🇦 Bianca Andreescu

• 🇨🇦 Leylah Fernandez

• 🇨🇦 Rebecca Marino

• 🇺🇸 Venus Williams

• Caroline Wozniacki

Protected ranking
• 🇺🇸 Jennifer Brady

• 🇺🇦 Elina Svitolina

Withdrawals
• 🇪🇸 Paula Badosa → replaced by 🇵🇱 Magdalena Fręch

• 🇹🇳 Ons Jabeur → replaced by 🇰🇿 Yulia Putintseva

• 🇨🇿 Barbora Krejčíková → replaced by 🇮🇹 Lucia Bronzetti

• Veronika Kudermetova → replaced by 🇺🇸 Lauren Davis

• 🇺🇦 Lesia Tsurenko → replaced by 🇪🇸 Cristina Bucșa

Seeds
• # 🇺🇦 Lesia Tsurenko (qualified, withdrew from main draw)

• # 🇺🇸 Alycia Parks (qualified)

• # 🇺🇸 Danielle Collins (qualified)

• # 🇮🇹 Camila Giorgi (qualified)

• # 🇨🇿 Linda Fruhvirtová (first round)

• # 🇺🇸 Peyton Stearns (qualified)

• # 🇰🇿 Yulia Putintseva (qualifying competition, lucky loser)

• # 🇬🇧 Katie Boulter (qualified)

• # 🇵🇱 Magdalena Fręch (qualifying competition, lucky loser)

• # 🇪🇸 Cristina Bucșa (qualifying competition, lucky loser)

• # 🇬🇧 Jodie Burrage (first round)

• # 🇺🇸 Kayla Day (qualified)

• # 🇦🇺 Kimberly Birrell (qualified)

• # 🇨🇳 Yuan Yue (first round)

• # 🇺🇸 Elizabeth Mandlik (qualifying competition)

• # 🇺🇸 Ashlyn Krueger (qualifying competition)

Qualifiers
• # 🇺🇦 Lesia Tsurenko

• # 🇺🇸 Alycia Parks

• # 🇺🇸 Danielle Collins

• # 🇮🇹 Camila Giorgi

• # 🇺🇸 Kayla Day

• # 🇺🇸 Peyton Stearns

• # 🇦🇺 Kimberly Birrell

• # 🇬🇧 Katie Boulter

Lucky losers
• # 🇰🇿 Yulia Putintseva

• # 🇵🇱 Magdalena Fręch

• # 🇪🇸 Cristina Bucșa