# 2018 Oracle Challenger Series – Chicago – Women's singles

This was the first edition of the tournament.
Petra Martić won the title, defeating Mona Barthel in the final, 6–4, 6–1.

## Seeds

* Danielle Collins (second round)
* Petra Martić (champion)
* Zarina Diyas (second round)
* Tatjana Maria (semifinals)
* Pauline Parmentier (first round)
* Sachia Vickery (semifinals, withdrew)
* Evgeniya Rodina (first round)
* Johanna Larsson (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 | Final | Final | Final | Final |
| 6 | Sachia Vickery | | | | | | |
| | Mona Barthel | w/o | | | | | |
| | Mona Barthel | w/o | | | Mona Barthel | 4 | 1 |
| | | | | 2 | Petra Martić | 6 | 6 |
| 4 | Tatjana Maria | 1 | 2 | 2 | Petra Martić | 6 | 6 |
| 2 | Petra Martić | 6 | 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 |
| 1/WC | D Collins | 6 | 6 | | | | | | | | | | | | | |
| | J Fett | 2 | 0 | | 1/WC | D Collins | 6$^6$ | 2 | | | | | | | | |
| | A Blinkova | 6 | 6 | | | A Blinkova | 7$^8$ | 6 | | | | | | | | |
| WC | F Di Lorenzo | 4 | 3 | | | | | | | | A Blinkova | 4 | 5 | | | |
| | Kr Plíšková | 7$^7$ | 2 | 2 | | | | | | 6 | S Vickery | 6 | 7 | | | |
| WC | A Kiick | 6$^3$ | 6 | 6 | WC | A Kiick | 4 | 0 | | | | | | | | |
| | O Jabeur | 4 | 6 | 4 | 6 | S Vickery | 6 | 6 | | | | | | | | |
| 6 | S Vickery | 6 | 4 | 6 | | | | | | | | | | 6 | S Vickery | |
| 3 | Z Diyas | 3 | 6 | 6 | | | | | | | | | | | M Barthel | w/o |
| | K Kozlova | 6 | 2 | 1 | 3 | Z Diyas | 2 | 6 | 3 | | | | | | | |
| | L Zhu | 7 | 2 | 4 | | M Barthel | 6 | 3 | 6 | | | | | | | |
| | M Barthel | 5 | 6 | 6 | | | | | | | M Barthel | 6 | 7$^7$ | | | |
| | E Bouchard | 6$^3$ | 4 | | | | | | | | D Yastremska | 2 | 6$^5$ | | | |
| Q | K Ahn | 7$^7$ | 6 | | Q | K Ahn | 6$^3$ | 4 | | | | | | | | |
| | D Yastremska | 6 | 7$^7$ | | | D Yastremska | 7$^7$ | 6 | | | | | | | | |
| 5 | P Parmentier | 2 | 6$^2$ | | | | | | | | | | | | | |

### 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 |
| 8 | J Larsson | 6 | 1 | 7$^7$ | | | | | | | | | | | | | |
| | B Haddad Maia | 4 | 6 | 6$^3$ | 8 | J Larsson | 6 | 3 | 3 | | | | | | | | |
| Q | F Abanda | 6 | 6 | | Q | F Abanda | 2 | 6 | 6 | | | | | | | | |
| Q | R Anderson | 3 | 1 | | | | | | | Q | F Abanda | 6$^7$ | 2 | | | | |
| | M Brengle | 6 | 6 | | | | | | | 4 | T Maria | 7$^9$ | 6 | | | | |
| WC | L Davis | 0 | 0 | | | M Brengle | 3 | 2 | | | | | | | | | |
| Q | I Falconi | 5 | 3 | | 4 | T Maria | 6 | 6 | | | | | | | | | |
| 4 | T Maria | 7 | 6 | | | | | | | | | | | 4 | T Maria | 1 | 2 |
| 7 | E Rodina | 2 | 3 | | | | | | | | | | | 2 | P Martić | 6 | 6 |
| | S Sorribes Tormo | 6 | 6 | | | S Sorribes Tormo | 4 | 7$^7$ | 4 | | | | | | | | |
| | K Boulter | 6 | 2 | 0$^r$ | WC | V Lepchenko | 6 | 6$^2$ | 6 | | | | | | | | |
| WC | V Lepchenko | 4 | 6 | 0 | | | | | | WC | V Lepchenko | 5 | 6$^3$ | | | | |
| | V Kudermetova | 6 | 0 | 3 | | | | | | 2 | P Martić | 7 | 7$^7$ | | | | |
| Q | S Karatantcheva | 3 | 6 | 6 | Q | S Karatantcheva | 4 | 2 | | | | | | | | | |
| Q | J Loeb | 1 | 3 | | 2 | P Martić | 6 | 6 | | | | | | | | | |
| 2 | P Martić | 6 | 6 | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Kristie Ahn (qualified)
* Irina Falconi (qualified)
* Jamie Loeb (qualified)
* Marie Bouzková (first round, retired)
* Elena Rybakina (qualifying competition)
* Sesil Karatantcheva (qualified)
* Ashley Kratzer (qualifying competition)
* Karman Thandi (first round)
* Françoise Abanda (qualified)
* Asia Muhammad (qualifying competition)
* Tereza Martincová (qualifying competition)
* Maria Sanchez (first round)

### Qualifiers

* Kristie Ahn
* Irina Falconi
* Jamie Loeb
* Robin Anderson
* Françoise Abanda
* Sesil Karatantcheva

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Kristie Ahn | 6 | 6 | | | | | | |
| WC | Michaela Gordon | 0 | 2 | | | | | | |
| WC | Michaela Gordon | 0 | 2 | | 1 | Kristie Ahn | 2 | 6 | 7 |
| | | | | | | Quinn Gleason | 6 | 4 | 5 |
| | Quinn Gleason | 7$^9$ | 0 | 6 | | Quinn Gleason | 6 | 4 | 5 |
| 8 | Karman Thandi | 6$^7$ | 6 | 1 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Irina Falconi | 6 | 6 | | | | |
| PR | Michaëlla Krajicek | 1 | 4 | | | | |
| PR | Michaëlla Krajicek | 1 | 4 | 2 | Irina Falconi | 6 | 6 |
| | | | | 7 | Ashley Kratzer | 4 | 4 |
| | Sanaz Marand | 4 | 0 | 7 | Ashley Kratzer | 4 | 4 |
| 7 | Ashley Kratzer | 6 | 6 | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3/WC | Jamie Loeb | 5 | 6 | 6 | | | | |
| WC | Jacqueline Cako | 7 | 3 | 2 | | | | |
| WC | Jacqueline Cako | 7 | 3 | 2 | 3/WC | Jamie Loeb | 6 | 6 |
| | | | | | 10 | Asia Muhammad | 1 | 2 |
| PR | Olga Govortsova | 6 | 3 | 0 | 10 | Asia Muhammad | 1 | 2 |
| 10 | Asia Muhammad | 1 | 6 | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Marie Bouzková | 7$^7$ | 3 | 0$^r$ | | | | |
| | Kayla Day | 6$^2$ | 6 | 2 | | | | |
| | Kayla Day | 6$^2$ | 6 | 2 | Kayla Day | 6 | 3 | 6$^5$ |
| | | | | | Robin Anderson | 2 | 6 | 7$^7$ |
| | Robin Anderson | 5 | 6 | 6 | Robin Anderson | 2 | 6 | 7$^7$ |
| 12 | Maria Sanchez | 7 | 3 | 2 | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Elena Rybakina | 6 | 6 | | | | | |
| WC | Naomi Cheong | 0 | 2 | | | | | |
| WC | Naomi Cheong | 0 | 2 | 5 | Elena Rybakina | 2 | 6 | 4 |
| | | | | 9 | Françoise Abanda | 6 | 4 | 6 |
| | Ana Veselinović | 1 | 3 | 9 | Françoise Abanda | 6 | 4 | 6 |
| 9 | Françoise Abanda | 6 | 6 | | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Sesil Karatantcheva | 6 | 7$^8$ | | | | | |
| | Jennifer Elie | 2 | 6$^6$ | | | | | |
| | Jennifer Elie | 2 | 6$^6$ | 6 | Sesil Karatantcheva | 3 | 6 | 6 |
| | | | | 11 | Tereza Martincová | 6 | 4 | 2 |
| | Alexa Guarachi | 4 | 0 | 11 | Tereza Martincová | 6 | 4 | 2 |
| 11 | Tereza Martincová | 6 | 6 | | | | | |