# 2019 Koser Jewelers Tennis Challenge – Singles

Madison Brengle was the defending champion, and successfully defended her title, defeating Zhu Lin in the final, 6–4, 7–5.

## Seeds

* Madison Brengle (champion)
* Zhu Lin (final)
* Katarina Zavatska (quarterfinals)
* Harriet Dart (second round)
* Yanina Wickmayer (quarterfinals)
* Paula Ormaechea (quarterfinals)
* Robin Anderson (withdrew)
* Ellen Perez (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 |
| 1 | Madison Brengle | 6 | 6 | | | | |
| Q | Victoria Duval | 4 | 3 | | | | |
| Q | Victoria Duval | 4 | 3 | 1 | Madison Brengle | 6 | 7 |
| | | | | 2 | Zhu Lin | 4 | 5 |
| WC | Sophia Whittle | 0 | 1 | 2 | Zhu Lin | 4 | 5 |
| 2 | Zhu Lin | 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 | Semifinals |
| 1 | M Brengle | 6 | 2 | 6 | | | | | | | | | | | | | |
| Q | L Cabrera | 3 | 6 | 3 | 1 | M Brengle | 6 | 6 | | | | | | | | | |
| Q | A Gabueva | 6$^5$ | 6 | 6 | Q | A Gabueva | 0 | 2 | | | | | | | | | |
| | Ar Rodionova | 7$^7$ | 3 | 1 | | | | | | 1 | M Brengle | 7 | 6 | | | | |
| | Z Hives | 1 | 7$^7$ | 2 | | | | | | | E-s Liang | 5 | 2 | | | | |
| | J Ponchet | 6 | 6$^5$ | 6 | | J Ponchet | 3 | 5 | | | | | | | | | |
| | E-s Liang | 6 | 6 | | | E-s Liang | 6 | 7 | | | | | | | | | |
| LL | J Rosenqvist | 4 | 0 | | | | | | | | | | | 1 | M Brengle | 6 | 6 |
| 4 | H Dart | 7 | 3 | 6 | | | | | | | | | | Q | V Duval | 4 | 3 |
| SE | C Harrison | 5 | 6 | 1 | 4 | H Dart | 6$^5$ | 3 | | | | | | | | | |
| WC | R Kingsley | 1 | 0 | | Q | V Duval | 7$^7$ | 6 | | | | | | | | | |
| Q | V Duval | 6 | 6 | | | | | | | Q | V Duval | 6 | 6 | | | | |
| | V Gracheva | 6 | 2 | 6 | | | | | | 6 | P Ormaechea | 2 | 3 | | | | |
| | S Xu | 1 | 6 | 0 | | V Gracheva | 7 | 1 | 2 | | | | | | | | |
| Q | M Sanchez | 7 | 1 | 2 | 6 | P Ormaechea | 5 | 6 | 6 | | | | | | | | |
| 6 | P Ormaechea | 5 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | E Perez | 7$^9$ | 7$^8$ | | | | | | | | | | | | | | |
| WC | J Loeb | 6$^7$ | 6$^6$ | | 8 | E Perez | 3 | 2 | | | | | | | | | |
| Q | A Bai | 4 | 1 | | WC | S Whittle | 6 | 6 | | | | | | | | | |
| WC | S Whittle | 6 | 6 | | | | | | | WC | S Whittle | 6 | 6 | | | | |
| | J Glushko | 3 | 7$^7$ | 6 | | | | | | 3 | K Zavatska | 3 | 3 | | | | |
| Q | X You | 6 | 6$^2$ | 0 | | J Glushko | 1 | 3 | | | | | | | | | |
| Q | E Bolton | 3 | 2 | | 3 | K Zavatska | 6 | 6 | | | | | | | | | |
| 3 | K Zavatska | 6 | 6 | | | | | | | | | | | WC | S Whittle | 0 | 1 |
| 5 | Y Wickmayer | 6 | 6 | | | | | | | | | | | 2 | L Zhu | 6 | 6 |
| | J Larsson | 4 | 2 | | 5 | Y Wickmayer | 7$^7$ | 6 | | | | | | | | | |
| WC | K Fahey | 2 | 6 | 5 | | A Shimizu | 6$^4$ | 4 | | | | | | | | | |
| | A Shimizu | 6 | 1 | 7 | | | | | | 5 | Y Wickmayer | 3 | 2 | | | | |
| | M Fręch | 2 | 6 | 6 | | | | | | 2 | L Zhu | 6 | 6 | | | | |
| Q | C Liu | 6 | 2 | 1 | | M Fręch | 6 | 2 | 2 | | | | | | | | |
| LL | A Okuno | 1 | 2 | | 2 | L Zhu | 2 | 6 | 6 | | | | | | | | |
| 2 | L Zhu | 6 | 6 | | | | | | | | | | | | | | |