| Singles | |
|---|---|
| 2018 Coupe Banque Nationale | |
| Champion |  Pauline Parmentier |
| Runner-up |  Jessica Pegula |
| Score | 7–5, 6–2 |
| Draw | 32 |
| Seeds | 8 |
Alison Van Uytvanck was the defending champion, but chose not to participate.
Pauline Parmentier won the title defeating Jessica Pegula in the final 7–5, 6–2.
Aryna Sabalenka (first round)
Petra Martić (quarterfinals)
Monica Puig (quarterfinals)
Monica Niculescu (first round) Sofia Kenin (semifinals)
Lucie Šafářová (first round)
Tatjana Maria (first round) Pauline Parmentier (champion)| Semifinals | Final | ||||||||||||
| 8 | Pauline Parmentier | 5 | 6 | 77 | |||||||||
 Heather Watson | 7 | 3 | 65 | ||||||||||
| 8 | Pauline Parmentier | 7 | 6 | ||||||||||
| Q | Jessica Pegula | 5 | 2 | ||||||||||
| 5 | Sofia Kenin | 6 | 2 | 4 | |||||||||
| Q | Jessica Pegula | 4 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Sabalenka | 4 | 65 | ||||||||||||||||||||||||
| V Lepchenko | 6 | 77 | V Lepchenko | 6 | 1 | 6 | |||||||||||||||||||||
| Q | M Bouzková | 6 | 6 | Q | M Bouzková | 1 | 6 | 3 | |||||||||||||||||||
| Q |  S Karatantcheva | 2 | 1 | V Lepchenko | 67 | 1 | |||||||||||||||||||||
 D Yastremska | 6 | 2 | 61 | 8 | P Parmentier | 79 | 6 | ||||||||||||||||||||
| C McHale | 2 | 6 | 77 | C McHale | 2 | 6 | 5 | ||||||||||||||||||||
 V Kudermetova | 5 | 3 | 8 | P Parmentier | 6 | 4 | 7 | ||||||||||||||||||||
| 8 | P Parmentier | 7 | 6 | 8 | P Parmentier | 5 | 6 | 77 | |||||||||||||||||||
| 4 | M Niculescu | 5 | 3 | H Watson | 7 | 3 | 65 | ||||||||||||||||||||
| H Watson | 7 | 6 | H Watson | 6 | 7 | ||||||||||||||||||||||
| WC |  LA Fernandez | 6 | 7 | WC | LA Fernandez | 4 | 5 | ||||||||||||||||||||
| Q | G Dabrowski | 3 | 5 | H Watson | 6 | 6 | |||||||||||||||||||||
| E Rodina | 6 | 3 | 1 | WC | R Marino | 3 | 4 | ||||||||||||||||||||
 G García Pérez | 4 | 6 | 6 | G García Pérez | 77 | 2 | 4 | ||||||||||||||||||||
| WC | R Marino | 6 | 6 | WC | R Marino | 63 | 6 | 6 | |||||||||||||||||||
| 7 | T Maria | 2 | 2 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | S Kenin | 6 | 6 | ||||||||||||||||||||||||
| M Barthel | 3 | 4 | 5 | S Kenin | 6 | 6 | |||||||||||||||||||||
| WC | F Abanda | 4 | 6 | 6 | WC | F Abanda | 4 | 4 | |||||||||||||||||||
| Q | T Martincová | 6 | 2 | 2 | 5 | S Kenin | 6 | 6 | |||||||||||||||||||
| Q | V Duval | 4 | 77 | 4 | 3 | M Puig | 3 | 1 | |||||||||||||||||||
| M Brengle | 6 | 62 | 6 | M Brengle | 5 | 0r | |||||||||||||||||||||
 B Haddad Maia | 2 | 3 | 3 | M Puig | 7 | 3 | |||||||||||||||||||||
| 3 | M Puig | 6 | 6 | 5 | S Kenin | 6 | 2 | 4 | |||||||||||||||||||
| 6 | L Šafářová | 64 | 6 | 5 | Q | J Pegula | 4 | 6 | 6 | ||||||||||||||||||
 O Jabeur | 77 | 3 | 7 | O Jabeur | 63 | 4 | |||||||||||||||||||||
| Q | J Pegula | 6 | 78 | Q | J Pegula | 77 | 6 | ||||||||||||||||||||
| Kr Plíšková | 3 | 66 | Q | J Pegula | 6 | 7 | |||||||||||||||||||||
| K Ahn | 1 | 4 | 2 | P Martić | 3 | 5 | |||||||||||||||||||||
| PR | O Govortsova | 6 | 6 | PR | O Govortsova | 0 | 2 | ||||||||||||||||||||
| N Broady | 1 | 1 | 2 | P Martić | 6 | 6 | |||||||||||||||||||||
| 2 | P Martić | 6 | 6 | ||||||||||||||||||||||||
Dalila Jakupović (qualifying competition) Marie Bouzková (qualified) Sesil Karatantcheva (qualified) Lauren Davis (qualifying competition) Asia Muhammad (withdrew, still competing in Chicago) Tereza Martincová (qualified) Victoria Duval (qualified) Jessica Pegula (qualified)
Jovana Jakšić (first round) Maria Sanchez (withdrew, still competing in Chicago) Emina Bektas (first round) Maria Mateas (qualifying competition)| First round | Qualifying competition | ||||||||||||
| 1 | Dalila Jakupović | 6 | 6 | ||||||||||
| Sophie Chang | 1 | 1 | |||||||||||
| 1 | Dalila Jakupović | 6 | 4 | 3 | |||||||||
| 7 | Victoria Duval | 2 | 6 | 6 | |||||||||
| Nika Kukharchuk | 2 | 2 | |||||||||||
| 7 | Victoria Duval | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Marie Bouzková | 6 | 7 | ||||||||||
| WC | Carson Branstine | 2 | 5 | ||||||||||
| 2 | Marie Bouzková | 6 | 6 | ||||||||||
| 12 | Maria Mateas | 3 | 2 | ||||||||||
| WC | Jada Bui | 4 | 1 | ||||||||||
| 12 | Maria Mateas | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Sesil Karatantcheva | 1 | 6 | 77 | |||||||||
| PR |  Michaëlla Krajicek | 6 | 3 | 64 | |||||||||
| 3 | Sesil Karatantcheva | 6 | 2 | ||||||||||
| Kayla Day | 2 | 0r | |||||||||||
| Kayla Day | 65 | 6 | 6 | ||||||||||
| Alt | Sabrina Santamaria | 77 | 4 | 3 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Lauren Davis | 6 | 2 | 6 | |||||||||
| Amanda Rodgers | 4 | 6 | 0 | ||||||||||
| 4 | Lauren Davis | 4 | 6 | 2 | |||||||||
| 8 | Jessica Pegula | 6 | 2 | 6 | |||||||||
| Jacqueline Cako | 4 | 2 | |||||||||||
| 8 | Jessica Pegula | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| Alt | Jennifer Elie | 77 | 6 | ||||||||||
| WC | Alexandra Vagramov | 65 | 3 | ||||||||||
| Alt | Jennifer Elie | 1 | 61 | ||||||||||
| WC | Gabriela Dabrowski | 6 | 77 | ||||||||||
| WC | Gabriela Dabrowski | 0 | 6 | 6 | |||||||||
| 9 | Jovana Jakšić | 6 | 4 | 4 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 6 | Tereza Martincová | 7 | 7 | ||||||||||
| Lucie Hradecká | 5 | 5 | |||||||||||
| 6 | Tereza Martincová | 6 | 6 | ||||||||||
| Katherine Sebov | 2 | 0 | |||||||||||
| Katherine Sebov | 6 | 6 | |||||||||||
| 11 | Emina Bektas | 2 | 4 | ||||||||||
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The 2018 Coupe Banque Nationale is a women's tennis tournament played on indoor carpet courts. It was the 26th edition of the Tournoi de Québec and part of the WTA International tournaments of the 2018 WTA Tour. It took place at the PEPS de l'Université Laval in Quebec City, Canada, from September 10 through September 16, 2018. Eighth-seeded Pauline Parmentier won the singles title.
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