# 2019 Oracle Challenger Series – Houston – Women's singles

Peng Shuai was the defending champion, but chose to compete in an ITF event in Tokyo instead.
Kirsten Flipkens won the title, defeating CoCo Vandeweghe in the final, 7–6$^{(7–4)}$, 6–4. Flipkens beat five American players in five matches on the way to her first WTA 125K series title.

## Seeds

All seeds received a bye into the second round.
* Danielle Collins (second round)
* Taylor Townsend (quarterfinals)
* Kirsten Flipkens (champion)
* Katarina Zavatska (quarterfinals)
* Patricia Maria Țig (withdrew)
* Caty McNally (quarterfinals)
* Stefanie Vögele (semifinals)
* Francesca Di Lorenzo (second round, retired)
* Whitney Osuigwe (second round)
* Mandy Minella (quarterfinals)
* Usue Maitane Arconada (third round)
* Allie Kiick (second round)
* Ann Li (third round)
* Caroline Dolehide (third round)
* Sachia Vickery (second round)
* Varvara Lepchenko (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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| WC | CoCo Vandeweghe | 6 | 6 | | | | | | | | | | |
| 10 | Mandy Minella | 1 | 4 | | | | | | | | | | |
| 10 | Mandy Minella | 1 | 4 | | WC | CoCo Vandeweghe | 3 | 6 | 7 | | | | |
| | | | | | 7 | Stefanie Vögele | 6 | 4 | 5 | | | | |
| 4 | Katarina Zavatska | 5 | 1 | | 7 | Stefanie Vögele | 6 | 4 | 5 | | | | |
| 7 | Stefanie Vögele | 7 | 6 | | | | | | | | | | |
| 7 | Stefanie Vögele | 7 | 6 | | | | | | | WC | CoCo Vandeweghe | 6$^4$ | 4 |
| | | | | | | | | | | 3 | Kirsten Flipkens | 7$^7$ | 6 |
| 6 | Caty McNally | 5 | 6 | 2 | | | | | | | | | | 3 | Kirsten Flipkens | 7$^7$ | 6 |
| 3 | Kirsten Flipkens | 7 | 4 | 6 | | | | | | | | | |
| 3 | Kirsten Flipkens | 7 | 4 | 6 | 3 | Kirsten Flipkens | 6 | 7 | | | | | |
| | | | | | PR | Irina Falconi | 3 | 5 | | | | | |
| PR | Irina Falconi | 7 | 6 | | PR | Irina Falconi | 3 | 5 | | | | | |
| 2 | Taylor Townsend | 5 | 1 | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 1/WC | D Collins | 0 | 6 | 3 | | | | | | | | |
| A Kalinina | A Kalinina | 6 | 6 | | A Kalinina | 6 | 3 | 6 | | | | | | | | |
| G Min | G Min | 3 | 4 | | | | | | | A Kalinina | 3 | 3 | | | | |
| WC | C Vandeweghe | 6 | 6 | | | | | | WC | C Vandeweghe | 6 | 6 | | | | |
| WC | L Huang | 4 | 1 | WC | C Vandeweghe | 7 | 6 | | | | | | | | | |
| | | | | 15 | S Vickery | 5 | 3 | | | | | | | | | |
| | | | | | | | | | | | | | WC | C Vandeweghe | 6 | 6 |
| | | | | | | | | | | | | | 10 | M Minella | 1 | 4 |
| | | | | 10 | M Minella | 1 | 6 | 6 | | | | | | | | |
| WC | K Jokić | 6 | 6 | WC | K Jokić | 6 | 3 | 4 | | | | | | | | |
| LL | K Day | 4 | 2 | | | | | | 10 | M Minella | 2 | | | | | |
| V Grammatikopoulou | V Grammatikopoulou | 6$^4$ | 4 | | | | | | | E Bouchard | 1$^r$ | | | | | |
| E Bouchard | E Bouchard | 7$^7$ | 6 | | E Bouchard | 6 | 3 | | | | | | | | | |
| | | | | 8 | F Di Lorenzo | 2 | 1$^r$ | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | K Zavatska | 3 | 6 | 6 | | | | | | | | |
| | J Ponchet | 4 | 7$^7$ | 7$^7$ | | J Ponchet | 6 | 3 | 4 | | | | | | | | |
| Q | S Chang | 6 | 6$^4$ | 6$^3$ | | | | | | 4 | K Zavatska | 6 | 6 | | | | |
| O Danilović | O Danilović | 6 | 7$^7$ | | | | | | | 13 | A Li | 3 | 3 | | | | |
| S Rogers | S Rogers | 3 | 6$^3$ | | | O Danilović | 1 | 5 | | | | | | | | | |
| | | | | | 13 | A Li | 6 | 7 | | | | | | | | | |
| | | | | | | | | | | | | | | 4 | K Zavatska | 5 | 1 |
| | | | | | | | | | | | | | | 7 | S Vögele | 7 | 6 |
| | | | | | 11 | UM Arconada | 6 | 6 | | | | | | | | | |
| G Cé | G Cé | 2 | 6 | 3 | | H Chang | 0 | 0 | | | | | | | | | |
| H Chang | H Chang | 6 | 3 | 6 | | | | | | 11 | UM Arconada | 1 | 2 | | | | |
| J Jakšić | J Jakšić | 4 | 3 | | | | | | | 7 | S Vögele | 6 | 6 | | | | |
| F Stollár | F Stollár | 6 | 6 | | | F Stollár | 4 | 6 | 3 | | | | | | | | |
| | | | | | 7 | S Vögele | 6 | 3 | 6 | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 6 | C McNally | 6 | 6 | | | | | | | | | | | |
| M Osaka | M Osaka | 6 | 7 | | M Osaka | 2 | 0 | | | | | | | | | | | |
| D Khazaniuk | D Khazaniuk | 1 | 5 | | | | | | 6 | C McNally | 6 | 2 | 6 | | | | | |
| D Gálfi | D Gálfi | 6 | 7 | | | | | | | D Gálfi | 0 | 6 | 3 | | | | | |
| J Loeb | J Loeb | 1 | 5 | | D Gálfi | 7 | 2 | 6 | | | | | | | | | | |
| | | | | 9 | W Osuigwe | 5 | 6 | 2 | | | | | | | | | | |
| | | | | | | | | | | | | | | 6 | C McNally | 5 | 6 | 2 |
| | | | | | | | | | | | | | | 3 | K Flipkens | 7 | 4 | 6 |
| | | | | 16 | V Lepchenko | 4 | 6 | 6$^5$ | | | | | | | | | | |
| Q | C Bellis | 6 | 6 | Q | C Bellis | 6 | 4 | 7$^7$ | | | | | | | | | | |
| | E Perez | 3 | 2 | | | | | | Q | C Bellis | 4 | 4 | | | | | | |
| H Baptiste | H Baptiste | 6 | 6 | | | | | | 3 | K Flipkens | 6 | 6 | | | | | | |
| E Kostova | E Kostova | 2 | 4 | | H Baptiste | 6 | 3 | 6$^4$ | | | | | | | | | | |
| | | | | 3 | K Flipkens | 3 | 6 | 7$^7$ | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | Alt | Q Gleason | 7 | 5 | 2 | | | | | | | | | |
| | N Podoroska | 4 | 1 | | PR | I Falconi | 5 | 7 | 6 | | | | | | | | | |
| PR | I Falconi | 6 | 6 | | | | | | | PR | I Falconi | 6 | 6 | | | | | |
| | D Lao | 3 | 4 | | | | | | | WC | B Mattek-Sands | 1 | 3 | | | | | |
| WC | B Mattek-Sands | 6 | 6 | | WC | B Mattek-Sands | 6 | 6 | | | | | | | | | | |
| | | | | | 12 | A Kiick | 0 | 0 | | | | | | | | | | |
| | | | | | | | | | | | | | | | PR | I Falconi | 7 | 6 |
| | | | | | | | | | | | | | | | 2 | T Townsend | 5 | 1 |
| | | | | | 14 | C Dolehide | 7 | 6 | | | | | | | | | | |
| C Harrison | C Harrison | 4 | 3 | | | G Olmos | 5 | 4 | | | | | | | | | | |
| G Olmos | G Olmos | 6 | 6 | | | | | | | 14 | C Dolehide | 7 | 2 | 3 | | | | |
| O Govortsova | O Govortsova | 2 | 6 | 3 | | | | | | 2 | T Townsend | 5 | 6 | 6 | | | | |
| A Danilina | A Danilina | 6 | 4 | 6 | | A Danilina | 2 | 4 | | | | | | | | | | |
| | | | | | 2 | T Townsend | 6 | 6 | | | | | | | | | | |

## Qualifying
### Seeds

* Alexa Glatch (qualifying competition)
* Giuliana Olmos (moved into main draw)

### Qualifiers

* Catherine Bellis
* Sophie Chang

### Lucky loser

* Kayla Day

### Qualifying draw
#### First qualifier

| Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1/WC | Alexa Glatch | 4 | 3 | |
| WC | Catherine Bellis | 6 | 6 | |

#### Second qualifier

| Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| Alt | Sophie Chang | 6 | 3 | 6 |
| | Kayla Day | 3 | 6 | 3 |