# 2023 Monterrey Challenger – Singles

Fernando Verdasco was the defending champion but chose not to defend his title.
Nuno Borges won the title after defeating Borna Gojo 6–4, 7–6$^{(8–6)}$ in the final.

## Seeds

* Adrian Mannarino (first round)
* Emilio Gómez (second round)
* Denis Kudla (quarterfinals)
* Daniel Altmaier (quarterfinals)
* Christopher Eubanks (first round)
* Nuno Borges (champion)
* Taro Daniel (second round)
* Yosuke Watanuki (semifinals)

## 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 |
| | Borna Gojo | 7$^7$ | 6 | | | | |
| 8 | Yosuke Watanuki | 6$^5$ | 4 | | | | |
| 8 | Yosuke Watanuki | 6$^5$ | 4 | | Borna Gojo | 4 | 6$^6$ |
| | | | | 6 | Nuno Borges | 6 | 7$^8$ |
| 6 | Nuno Borges | 7$^7$ | 7$^7$ | 6 | Nuno Borges | 6 | 7$^8$ |
| | Mitchell Krueger | 6$^3$ | 6$^3$ | | | | |

### 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 | A Mannarino | 5 | 6$^4$ | | | | | | | | | | | | | | |
| | A Kovacevic | 7 | 7$^7$ | | | A Kovacevic | 6 | 6 | | | | | | | | | |
| | N Mejía | 6 | 1 | 6 | | N Mejía | 3 | 2 | | | | | | | | | |
| | S Mansouri | 4 | 6 | 3 | | | | | | A Kovacevic | 6$^5$ | 6 | 2 | | | | |
| | B Gojo | 6 | 7$^7$ | | | | | | | B Gojo | 7$^7$ | 3 | 6 | | | | |
| WC | R Pacheco Méndez | 3 | 6$^3$ | | | B Gojo | 6 | 6 | | | | | | | | | |
| | S Johnson | 4 | 6 | 3 | 7 | T Daniel | 2 | 4 | | | | | | | | | |
| 7 | T Daniel | 6 | 3 | 6 | | | | | | | | | | | B Gojo | 7$^7$ | 6 |
| 3 | D Kudla | 6 | 6 | | | | | | | | | | | 8 | Y Watanuki | 6$^5$ | 4 |
| | M Bellucci | 2 | 4 | | 3 | D Kudla | 6 | 6 | | | | | | | | | |
| Q | N Chappell | 6 | 6 | | Q | N Chappell | 3 | 4 | | | | | | | | | |
| Q | J Flores | 3 | 2 | | | | | | 3 | D Kudla | 6 | 6$^3$ | 2 | | | | |
| WC | E Escobedo | 6 | 2 | 2 | | | | | 8 | Y Watanuki | 3 | 7$^7$ | 6 | | | | |
| | B Paire | 2 | 6 | 6 | | B Paire | 6$^2$ | 1 | | | | | | | | | |
| WC | James Van Deinse | 0 | 1 | | 8 | Y Watanuki | 7$^7$ | 6 | | | | | | | | | |
| 8 | Y Watanuki | 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 |
| 6 | N Borges | 6 | 6 | | | | | | | | | | | | | | |
| PR | B Klahn | 2 | 2 | | 6 | N Borges | 6 | 6 | | | | | | | | | |
| Q | E Zhu | 7$^7$ | 5 | 6 | Q | E Zhu | 2 | 4 | | | | | | | | | |
| | T-l Wu | 6$^2$ | 7 | 4 | | | | | | 6 | N Borges | 7$^7$ | 6 | | | | |
| | M Marterer | 6 | 6 | | | | | | | 4 | D Altmaier | 6$^2$ | 4 | | | | |
| | G Elias | 3 | 4 | | | M Marterer | 6$^1$ | 3 | | | | | | | | | |
| | B Holt | 6$^4$ | 3 | | 4 | D Altmaier | 7$^7$ | 6 | | | | | | | | | |
| 4 | D Altmaier | 7$^7$ | 6 | | | | | | | | | | | 6 | N Borges | 7$^7$ | 7$^7$ |
| 5 | C Eubanks | 4 | 3 | | | | | | | | | | | | M Krueger | 6$^3$ | 6$^3$ |
| Q | G Andreozzi | 6 | 6 | | Q | G Andreozzi | 3 | 1$^r$ | | | | | | | | | |
| | M Krueger | 6 | 5 | 6 | | M Krueger | 6 | 2 | | | | | | | | | |
| | S Diez | 4 | 7 | 4 | | | | | | | M Krueger | 6 | 2 | | | | |
| Q | B Tomic | 7$^7$ | 6 | | | | | | | Q | B Tomic | 4 | 1$^r$ | | | | |
| | JP Ficovich | 6$^3$ | 1 | | Q | B Tomic | 4 | 6 | 7$^7$ | | | | | | | | |
| Q | D Yevseyev | 6$^6$ | 4 | | 2 | E Gómez | 6 | 4 | 6$^4$ | | | | | | | | |
| 2 | E Gómez | 7$^8$ | 6 | | | | | | | | | | | | | | |