# 2023 Rancho Santa Fe Open – Singles

Marcela Zacarías was the defending champion but chose not to participate.
Yulia Starodubtseva won the title, defeating Lulu Sun in the final, 7–5, 6–3.

## Seeds

* Julia Riera (second round)
* Elvina Kalieva (second round)
* Tatiana Prozorova (first round)
* Yulia Starodubtseva (champion)
* Louisa Chirico (quarterfinals)
* Stacey Fung (second round)
* Anastasia Tikhonova (semifinals)
* Lulu Sun (final)

## 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 |
| 7 | Anastasia Tikhonova | 3 | 2 | | | | |
| 8 | Lulu Sun | 6 | 6 | | | | |
| 8 | Lulu Sun | 6 | 6 | 8 | Lulu Sun | 5 | 3 |
| | | | | 4 | Yulia Starodubtseva | 7 | 6 |
| 4 | Yulia Starodubtseva | 6 | 6 | 4 | Yulia Starodubtseva | 7 | 6 |
| Q | Han Jiangxue | 3 | 4 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | J Riera | 6 | 6$^5$ | 6 | | | | | | | | | | | | |
| LL | T Kinard | 1 | 7$^7$ | 2 | 1 | J Riera | 3 | 4 | | | | | | | | |
| | M Herazo González | 3 | 0$^r$ | | SE | S Ishii | 6 | 6 | | | | | | | | |
| SE | S Ishii | 6 | 4 | | | | | | SE | S Ishii | 2 | 2 | | | | |
| | H Giavara | 6 | 6 | | | | | | 7 | A Tikhonova | 6 | 6 | | | | |
| Q | K Hance | 4 | 4 | | | H Giavara | 4 | 3 | | | | | | | | |
| WC | K McKenzie | 6 | 4 | 2 | 7 | A Tikhonova | 6 | 6 | | | | | | | | |
| 7 | A Tikhonova | 4 | 6 | 6 | | | | | | | | | 7 | A Tikhonova | 3 | 2 |
| 3 | T Prozorova | 3 | 3 | | | | | | | | | | 8 | L Sun | 6 | 6 |
| Q | M Kozyreva | 6 | 6 | | Q | M Kozyreva | 7$^9$ | 6 | | | | | | | | |
| | H Chang | 6 | 6 | | | H Chang | 6$^7$ | 4 | | | | | | | | |
| LL | A Ahn | 1 | 2 | | | | | | Q | M Kozyreva | 6$^0$ | 2 | | | | |
| WC | E Douglas | 7$^7$ | 7$^7$ | | | | | | 8 | L Sun | 7$^7$ | 6 | | | | |
| Q | S Lý-Nguyễn | 6$^2$ | 6$^3$ | | WC | E Douglas | 3 | 6$^6$ | | | | | | | | |
| | K Scott | 3 | 3 | | 8 | L Sun | 6 | 7$^8$ | | | | | | | | |
| 8 | L Sun | 6 | 6 | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | L Chirico | 6 | 6 | | | | | | | | | | | | | | |
| Q | P Corley | 0 | 3 | 5 | L Chirico | 6 | 7 | | | | | | | | | | |
| | M Jones | 7 | 6 | | M Jones | 3 | 5 | | | | | | | | | | |
| JE | F Tian | 5 | 4 | | | | | | 5 | L Chirico | 6 | 3 | 4 | | | | |
| | J DeFalco | 5 | 3 | | | | | | 4 | Y Starodubtseva | 4 | 6 | 6 | | | | |
| | J Aney | 7 | 6 | | J Aney | 1 | 2 | | | | | | | | | | |
| | J Svendsen | 2 | 4 | 4 | Y Starodubtseva | 6 | 6 | | | | | | | | | | |
| 4 | Y Starodubtseva | 6 | 6 | | | | | | | | | | | 4 | Y Starodubtseva | 6 | 6 |
| 6 | S Fung | 6 | 6 | | | | | | | | | | | Q | J Han | 3 | 4 |
| WC | M Sieg | 3 | 4 | 6 | S Fung | 4 | 1 | | | | | | | | | | |
| Q | E Cayetano | 6 | 6 | Q | E Cayetano | 6 | 6 | | | | | | | | | | |
| Q | N Rivkin | 2 | 3 | | | | | | Q | E Cayetano | 5 | 3 | | | | | |
| | S Yamalapalli | 3 | 5 | | | | | | Q | J Han | 7 | 6 | | | | | |
| Q | J Han | 6 | 7 | Q | J Han | 4 | 6 | 7$^8$ | | | | | | | | | |
| Q | M McCray | 4 | 0 | 2 | E Kalieva | 6 | 1 | 6$^6$ | | | | | | | | | |
| 2 | E Kalieva | 6 | 6 | | | | | | | | | | | | | | |