# 2018 Koser Jewelers Tennis Challenge – Singles

Vera Lapko was the defending champion, but chose to participate in Montreal.
Madison Brengle won the title after Kristie Ahn retired in the final at 6–4, 1–0.

## Seeds

* Nicole Gibbs (first round)
* Arantxa Rus (first round)
* Madison Brengle (champion)
* Vera Zvonareva (first round)
* Heather Watson (first round)
* Anastasia Potapova (second round)
* Anhelina Kalinina (quarterfinals)
* Naomi Broady (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 | Final |
| | Priscilla Hon | 5 | 5 | | | | | |
| 3 | Madison Brengle | 7 | 7 | | | | | |
| 3 | Madison Brengle | 7 | 7 | | 3 | Madison Brengle | 6 | 1 |
| | | | | | | Kristie Ahn | 4 | 0$^r$ |
| PR | Jessica Pegula | 7$^7$ | 6$^7$ | 4 | | Kristie Ahn | 4 | 0$^r$ |
| | Kristie Ahn | 6$^3$ | 7$^9$ | 6 | | | | |

### 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 |
| 1 | N Gibbs | 6 | 6$^5$ | 2 | | | | | | | | | | | | | |
| | P Hon | 4 | 7$^7$ | 6 | | P Hon | 6 | 7 | | | | | | | | | |
| | O Rogowska | 7$^8$ | 6 | | | O Rogowska | 2 | 5 | | | | | | | | | |
| WC | L Davis | 6$^6$ | 4 | | | | | | | | P Hon | 7$^7$ | 3 | | | | |
| | F Di Lorenzo | 6 | 6 | | | | | | | 7 | A Kalinina | 6$^5$ | 0$^r$ | | | | |
| | J Loeb | 2 | 3 | | | F Di Lorenzo | 3 | 2 | | | | | | | | | |
| Q | H Carter | 2 | 2 | | 7 | A Kalinina | 6 | 6 | | | | | | | | | |
| 7 | A Kalinina | 6 | 6 | | | | | | | | | | | | P Hon | 5 | 5 |
| 3 | M Brengle | 7$^7$ | 2 | 6 | | | | | | | | | | 3 | M Brengle | 7 | 7 |
| | Ar Rodionova | 6$^3$ | 6 | 1 | 3 | M Brengle | 4 | 6 | 0 | | | | | | | | |
| WC | J Kissell | 0 | 2 | | | G Taylor | 6 | 3 | 0$^r$ | | | | | | | | |
| | G Taylor | 6 | 6 | | | | | | | 3 | M Brengle | 6 | 6 | | | | |
| | S Lisicki | 6 | 7$^7$ | | | | | | | SE | A Li | 0 | 2 | | | | |
| | G Min | 1 | 6$^5$ | | | S Lisicki | 3 | 3$^r$ | | | | | | | | | |
| SE | A Li | 6 | 7$^9$ | | SE | A Li | 6 | 4 | | | | | | | | | |
| 5 | H Watson | 1 | 6$^7$ | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | A Potapova | 2 | 6 | 6 | | | | | | | | | | | | | | |
| Q | R Ozaki | 6 | 4 | 0 | 6 | A Potapova | 2 | 6$^5$ | | | | | | | | | | |
| WC | G Brodsky | 6 | 5 | 7 | WC | G Brodsky | 6 | 7$^7$ | | | | | | | | | | |
| WC | S Chang | 2 | 7 | 5 | | | | | WC | G Brodsky | 2 | 4 | | | | | | |
| PR | O Govortsova | 4 | | | | | | | PR | J Pegula | 6 | 6 | | | | | | |
| | F Stollár | 0$^r$ | | | PR | O Govortsova | 2 | 2 | | | | | | | | | | |
| PR | J Pegula | 6 | 6 | | PR | J Pegula | 6 | 6 | | | | | | | | | | |
| 4 | V Zvonareva | 4 | 3 | | | | | | | | | | | PR | J Pegula | 7$^7$ | 6$^7$ | 4 |
| 8 | N Broady | 2 | 6$^4$ | | | | | | | | | | | | K Ahn | 6$^3$ | 7$^9$ | 6 |
| | K Ahn | 6 | 7$^7$ | | | K Ahn | w/o | | | | | | | | | | | |
| LL | E Hozumi | 3 | 2 | | | K Swan | | | | | | | | | | | | |
| | K Swan | 6 | 6 | | | | | | | K Ahn | 4 | 6 | 6 | | | | | |
| Q | K Birrell | 7$^7$ | 6 | | | | | | Q | K Birrell | 6 | 4 | 4 | | | | | |
| Q | J Ponchet | 6$^5$ | 1 | | Q | K Birrell | 6 | 7$^7$ | | | | | | | | | | |
| | G García Pérez | 6 | 6 | | | G García Pérez | 2 | 6$^3$ | | | | | | | | | | |
| 2 | A Rus | 4 | 0 | | | | | | | | | | | | | | | |