# 2021 Ambato La Gran Ciudad – Singles

This was the first edition of the tournament.
Thiago Agustín Tirante won the title after defeating Juan Pablo Varillas 7–5, 7–5 in the final.

## Seeds

* Juan Pablo Varillas (final)
* Andrej Martin (second round)
* Hugo Dellien (withdrew)
* Emilio Gómez (first round)
* Renzo Olivo (first round)
* Juan Pablo Ficovich (semifinals)
* Thiago Agustín Tirante (champion)
* Mirza Bašić (first 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 | Semifinals | Final | Final | Final | Final |
| 1 | Juan Pablo Varillas | 6 | 6 | | | | | |
| 6 | Juan Pablo Ficovich | 3 | 4 | | | | | |
| 6 | Juan Pablo Ficovich | 3 | 4 | | 1 | Juan Pablo Varillas | 5 | 5 |
| | | | | | 7 | Thiago Agustín Tirante | 7 | 7 |
| 7 | Thiago Agustín Tirante | 7 | 5 | 6 | 7 | Thiago Agustín Tirante | 7 | 7 |
| | Facundo Mena | 5 | 7 | 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 | JP Varillas | 6 | 3 | 7$^8$ | | | | | | | | | | | | | |
| | R Quiroz | 3 | 6 | 6$^6$ | 1 | JP Varillas | 6 | 6 | | | | | | | | | |
| | N Hardt | 2 | 6$^6$ | | | GA Olivieri | 1 | 3 | | | | | | | | | |
| | GA Olivieri | 6 | 7$^8$ | | | | | | 1 | JP Varillas | 6 | 6 | | | | | |
| | A Menéndez Maceiras | 2 | 5 | | | | | | Q | M Zukas | 2 | 4 | | | | | |
| | N Fatić | 6 | 7 | | | N Fatić | 4 | 1$^r$ | | | | | | | | | |
| Q | Matías Zukas | 6 | 5 | 6 | Q | M Zukas | 6 | 2 | | | | | | | | | |
| 5 | R Olivo | 4 | 7 | 4 | | | | | | | | | | 1 | JP Varillas | 6 | 6 |
| LL | A González | 3 | 4 | | | | | | | | | | | 6 | JP Ficovich | 3 | 4 |
| | P Sakamoto | 6 | 6 | | | P Sakamoto | 3 | 4 | | | | | | | | | |
| Q | Pol Martín Tiffon | 5 | 6$^7$ | | | J Nikles | 6 | 6 | | | | | | | | | |
| | J Nikles | 7 | 7$^9$ | | | | | | | J Nikles | 6 | 6$^2$ | 5 | | | | |
| Q | A Gómez | 6 | 6 | | | | | | 6 | JP Ficovich | 0 | 7$^7$ | 7 | | | | |
| WC | AC March | 3 | 4 | | Q | A Gómez | 2 | 6$^{11}$ | | | | | | | | | |
| WC | Daniel Espín Pérez | 1 | 0 | | 6 | JP Ficovich | 6 | 7$^{13}$ | | | | | | | | | |
| 6 | JP Ficovich | 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 | Semifinals |
| 7 | TA Tirante | 7$^7$ | 4 | 7$^7$ | | | | | | | | | | | | | | |
| | C Rodríguez | 6$^4$ | 6 | 6$^5$ | 7 | TA Tirante | 7$^7$ | 3 | 7$^7$ | | | | | | | | | |
| | C Gómez-Herrera | 6 | 6$^6$ | 6 | | C Gómez-Herrera | 6$^5$ | 6 | 6$^1$ | | | | | | | | | |
| | Eduard Esteve Lobato | 4 | 7$^8$ | 3 | | | | | | 7 | TA Tirante | 6 | 6 | | | | | |
| PR | G Melzer | 6$^7$ | 6 | 6 | | | | | | PR | G Melzer | 3 | 4 | | | | | |
| Q | P Kypson | 7$^9$ | 1 | 4 | PR | G Melzer | 6 | 7 | | | | | | | | | | |
| | J Lenz | 6 | 7$^8$ | | | J Lenz | 3 | 5 | | | | | | | | | | |
| 4 | E Gómez | 4 | 6$^6$ | | | | | | | | | | | 7 | TA Tirante | 7 | 5 | 6 |
| 8 | M Bašić | 6$^7$ | 4 | | | | | | | | | | | | F Mena | 5 | 7 | 3 |
| | L Catarina | 7$^9$ | 6 | | | L Catarina | 6 | 6$^3$ | 4 | | | | | | | | | |
| WC | D Hidalgo | 4 | 3 | | | F Mena | 4 | 7$^7$ | 6 | | | | | | | | | |
| | F Mena | 6 | 6 | | | | | | | | F Mena | 7$^9$ | 6 | | | | | |
| LL | Alexis Gautier | 6 | 6$^7$ | 6 | | | | | | LL | A Gautier | 6$^7$ | 4 | | | | | |
| SE | G Lama | 4 | 7$^9$ | 3 | LL | A Gautier | 6 | 7$^7$ | | | | | | | | | | |
| | O Roca Batalla | 4 | 6 | 6$^7$ | 2 | A Martin | 3 | 6$^1$ | | | | | | | | | | |
| 2 | A Martin | 6 | 3 | 7$^9$ | | | | | | | | | | | | | | |