# 2018 Challenger Banque Nationale de Saguenay – Singles

Gréta Arn was the defending champion, but chose not to participate.
Katherine Sebov won the title, defeating Quirine Lemoine in the final, 7–6$^{(12–10)}$, 7–6$^{(7–4)}$.

## Seeds

* Kateryna Kozlova (quarterfinals)
* Conny Perrin (quarterfinals)
* Richèl Hogenkamp (quarterfinals)
* Naomi Broady (first round)
* Elitsa Kostova (first round)
* Jessika Ponchet (quarterfinals)
* Bianca Andreescu (semifinals, retired)
* Kimberley Zimmermann (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final |
| | Katherine Sebov | 6 | 1 | 6 | | | |
| Q | Daria Lopatetska | 2 | 6 | 2 | | | |
| Q | Daria Lopatetska | 2 | 6 | 2 | Katherine Sebov | 7$^{12}$ | 7$^7$ |
| | | | | | Quirine Lemoine | 6$^{10}$ | 6$^4$ |
| 7 | Bianca Andreescu | 6$^4$ | 0$^r$ | | Quirine Lemoine | 6$^{10}$ | 6$^4$ |
| | Quirine Lemoine | 7$^7$ | 2 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | K Kozlova | 6 | 4 | | | | | | | | | | | | | | | |
| | S Reix | 4 | 0$^r$ | | 1 | K Kozlova | 6 | 6 | | | | | | | | | | |
| | J Cako | 6$^3$ | 6 | 5 | WC | A Vagramov | 2 | 0 | | | | | | | | | | |
| WC | A Vagramov | 7$^7$ | 1 | 7 | | | | | | 1 | K Kozlova | 1 | 1 | | | | | |
| Q | K Shaffer | 6 | 6 | | | | | | | | K Sebov | 6 | 6 | | | | | |
| | A Sadiković | 2 | 1 | | Q | K Shaffer | 2 | 2 | | | | | | | | | | |
| | K Sebov | 0 | 6 | 6 | | K Sebov | 6 | 6 | | | | | | | | | | |
| 8 | K Zimmermann | 6 | 1 | 4 | | | | | | | | | | | K Sebov | 6 | 1 | 6 |
| 4 | N Broady | 3 | 2 | | | | | | | | | | | Q | D Lopatetska | 2 | 6 | 2 |
| Q | D Lopatetska | 6 | 6 | | Q | D Lopatetska | 6 | 5 | 6 | | | | | | | | | |
| | M Arcangioli | 1 | 5 | | | M Arcangioli | 0 | 7 | 2 | | | | | | | | | |
| | M Osaka | 6 | 2$^r$ | | | | | | | Q | D Lopatetska | 7 | 6 | | | | | |
| | UM Arconada | 6 | 4 | 1 | | | | | | 6 | J Ponchet | 5 | 4 | | | | | |
| | R Anderson | 4 | 6 | 6 | | R Anderson | 2 | 6 | 3 | | | | | | | | | |
| | T Moore | 1 | 1 | | 6 | J Ponchet | 6 | 3 | 6 | | | | | | | | | |
| 6 | J Ponchet | 6 | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | B Andreescu | 6 | 6 | | | | | | | | | | | | | | | |
| WC | P Januskova | 1 | 0 | | 7 | B Andreescu | 7 | 7 | | | | | | | | | | |
| Q | H Carter | 6 | 3 | 6 | Q | H Carter | 5 | 5 | | | | | | | | | | |
| Q | J Ho | 1 | 6 | 4 | | | | | | 7 | B Andreescu | 4 | 6 | 6 | | | | |
| WC | C Branstine | 2 | 6$^6$ | | | | | | | 3 | R Hogenkamp | 6 | 3 | 1 | | | | |
| | F Jones | 6 | 7$^8$ | | | F Jones | 2 | 5 | | | | | | | | | | |
| | M Chwalińska | 6 | 6$^5$ | 3 | 3 | R Hogenkamp | 6 | 7 | | | | | | | | | | |
| 3 | R Hogenkamp | 4 | 7$^7$ | 6 | | | | | | | | | | | 7 | B Andreescu | 6$^4$ | 0$^r$ |
| 5 | E Kostova | 4 | 3 | | | | | | | | | | | | | Q Lemoine | 7$^7$ | 2 |
| WC | J Bui | 6 | 6 | | WC | J Bui | 1 | 1 | | | | | | | | | | |
| | Q Lemoine | 6 | 6 | | | Q Lemoine | 6 | 6 | | | | | | | | | | |
| | A Cadanțu | 1 | 1 | | | | | | | | Q Lemoine | 6 | 7 | | | | | |
| | M Sanchez | 6 | 6 | | | | | | | 2 | C Perrin | 4 | 5 | | | | | |
| | M Mateas | 2 | 4 | | | M Sanchez | 6 | 5 | 2 | | | | | | | | | |
| | M Manasse | 1 | 2 | | 2 | C Perrin | 4 | 7 | 6 | | | | | | | | | |
| 2 | C Perrin | 6 | 6 | | | | | | | | | | | | | | | |