# 2018 Stockton Challenger – Women's singles

Sofia Kenin was the defending champion, but chose not to participate.
Madison Brengle won the title, defeating Danielle Lao in an all-American final, 7–5, 7–6$^{(12–10)}$.

## Seeds

* Madison Brengle (champion)
* Jessica Pegula (semifinals)
* Sofya Zhuk (semifinals)
* Marie Bouzková (second round)
* Kristie Ahn (first round)
* Jamie Loeb (second round)
* Beatriz Haddad Maia (first round)
* Lauren Davis (second 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 |
| 1 | Madison Brengle | 6 | 6 | | | | | |
| 3 | Sofya Zhuk | 1 | 1 | | | | | |
| 3 | Sofya Zhuk | 1 | 1 | | 1 | Madison Brengle | 7 | 7$^{12}$ |
| | | | | | | Danielle Lao | 5 | 6$^{10}$ |
| | Danielle Lao | 1 | 6 | 6 | | Danielle Lao | 5 | 6$^{10}$ |
| 2 | Jessica Pegula | 6 | 2 | 2 | | | | |

### Top 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 |
| 1 | M Brengle | 6 | 7 | | | | | | | | | | | | | | |
| | U Eikeri | 4 | 5 | | 1 | M Brengle | 6 | 6 | | | | | | | | | |
| LL | J Elie | 3 | 1 | | | A Kratzer | 3 | 1 | | | | | | | | | |
| | A Kratzer | 6 | 6 | | | | | | 1 | M Brengle | 6 | 6 | | | | | |
| | J Jakšić | 1$^r$ | | | | | | | | A Li | 2 | 1 | | | | | |
| | A Li | 4 | | | | A Li | 6 | 7 | | | | | | | | | |
| WC | V Duval | 6 | 5 | 5 | 8 | L Davis | 2 | 5 | | | | | | | | | |
| 8 | L Davis | 4 | 7 | 7 | | | | | | | | | | 1 | M Brengle | 6 | 6 |
| 3 | S Zhuk | 6 | 7$^9$ | | | | | | | | | | | 3 | S Zhuk | 1 | 1 |
| | K Day | 3 | 6$^7$ | | 3 | S Zhuk | 6 | 6 | | | | | | | | | |
| Q | M Manasse | 7$^7$ | 4 | 6 | Q | M Manasse | 4 | 3 | | | | | | | | | |
| | R Marino | 6$^4$ | 6 | 0 | | | | | 3 | S Zhuk | 4 | 6 | 6 | | | | |
| | M Osaka | 6 | 6 | | | | | | | R Anderson | 6 | 4 | 4 | | | | |
| | M Sanchez | 1 | 3 | | | M Osaka | 5 | 4 | | | | | | | | | |
| | R Anderson | 6 | 4 | 7$^7$ | | R Anderson | 7 | 6 | | | | | | | | | |
| 5 | K Ahn | 1 | 6 | 6$^4$ | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6/WC | J Loeb | 6 | 6 | | | | | | | | | | | | | | | |
| | E Bektas | 4 | 1 | | 6/WC | J Loeb | 3 | 1 | | | | | | | | | | |
| Q | K Volynets | 5 | 1 | | JE | W Osuigwe | 6 | 6 | | | | | | | | | | |
| JE | W Osuigwe | 7 | 6 | | | | | | | JE | W Osuigwe | 2 | 0 | | | | | |
| Q | S Marand | 0 | 6 | 6$^4$ | | | | | | | D Lao | 6 | 6 | | | | | |
| | D Lao | 6 | 2 | 7$^7$ | | D Lao | 6 | 6 | | | | | | | | | | |
| WC | D Willson | 1 | 0 | | 4 | M Bouzková | 3 | 3 | | | | | | | | | | |
| 4 | M Bouzková | 6 | 6 | | | | | | | | | | | | D Lao | 1 | 6 | 6 |
| 7 | B Haddad Maia | 6 | 5 | 0$^r$ | | | | | | | | | | 2 | J Pegula | 6 | 2 | 2 |
| | S Karatantcheva | 4 | 7 | 0 | | S Karatantcheva | 6 | 6$^1$ | 2 | | | | | | | | | |
| | L Chirico | 4 | 1 | | Q | A Sadiković | 2 | 7$^7$ | 6 | | | | | | | | | |
| Q | A Sadiković | 6 | 6 | | | | | | | Q | A Sadiković | 4 | 0 | | | | | |
| WC | H Carter | 7$^7$ | 2 | 6 | | | | | | 2 | J Pegula | 6 | 6 | | | | | |
| | K Sebov | 6$^2$ | 6 | 1 | WC | H Carter | 6$^3$ | 0 | | | | | | | | | | |
| | N Podoroska | 0 | 0$^r$ | | 2 | J Pegula | 7$^7$ | 6 | | | | | | | | | | |
| 2 | J Pegula | 6 | 0 | | | | | | | | | | | | | | | |