# 2021 Campeonato Internacional de Tênis de Campinas – Singles

Francisco Cerúndolo was the defending champion but lost in the semifinals to Sebastián Báez.
Báez won the title after defeating Thiago Monteiro 6–1, 6–4 in the final.

## Seeds

* Federico Coria (first round)
* Jaume Munar (first round)
* Juan Manuel Cerúndolo (quarterfinals)
* Thiago Monteiro (final)
* Pablo Cuevas (first round)
* Daniel Elahi Galán (first round)
* Sebastián Báez (champion)
* Francisco Cerúndolo (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 | Semifinals | Final | Final | Final | Final |
| | Tomás Martín Etcheverry | 6 | 2 | 3 | | | | |
| 4 | Thiago Monteiro | 1 | 6 | 6 | | | | |
| 4 | Thiago Monteiro | 1 | 6 | 6 | 4 | Thiago Monteiro | 1 | 4 |
| | | | | | 7 | Sebastián Báez | 6 | 6 |
| 8 | Francisco Cerúndolo | 6 | 1 | 2 | 7 | Sebastián Báez | 6 | 6 |
| 7 | Sebastián Báez | 4 | 6 | 6 | | | | |

### Top 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 | Semifinals |
| 1 | F Coria | 2 | 3 | | | | | | | | | | | | | | | |
| | N Jarry | 6 | 6 | | N Jarry | 6 | 6 | | | | | | | | | | | |
| | C Ugo Carabelli | 7$^7$ | 3 | | C Ugo Carabelli | 1 | 2 | | | | | | | | | | | |
| | T Seyboth Wild | 6$^4$ | 1$^r$ | | | | | | | N Jarry | 4 | 1 | | | | | | |
| | TM Etcheverry | 6 | 6 | | | | | | | TM Etcheverry | 6 | 6 | | | | | | |
| | R Cid Subervi | 2 | 0 | | TM Etcheverry | 3 | 6 | 6 | | | | | | | | | | |
| | N Kuhn | 7 | 6 | | N Kuhn | 6 | 4 | 1 | | | | | | | | | | |
| 6 | DE Galán | 5 | 3 | | | | | | | | | | | | TM Etcheverry | 6 | 2 | 3 |
| 4 | T Monteiro | 6 | 6 | | | | | | | | | | | 4 | T Monteiro | 1 | 6 | 6 |
| Q | J Nikles | 2 | 1 | 4 | T Monteiro | 5 | | | | | | | | | | | | |
| | JP Varillas | 6 | 6 | | JP Varillas | 1$^r$ | | | | | | | | | | | | |
| WC | Matheus Bueres | 2 | 1 | | | | | | 4 | T Monteiro | 6$^4$ | 6 | 7$^7$ | | | | | |
| | T Skatov | 6 | 7$^7$ | | | | | | | T Skatov | 7$^7$ | 3 | 6$^4$ | | | | | |
| | R Olivo | 3 | 6$^3$ | | T Skatov | 7$^7$ | 6 | | | | | | | | | | | |
| | A Collarini | 6 | 6 | | A Collarini | 6$^2$ | 2 | | | | | | | | | | | |
| 5 | P Cuevas | 3 | 3 | | | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | F Cerúndolo | 6 | 6 | | | | | | | | | | | | | | | | |
| WC | Gilbert Klier Júnior | 3 | 0 | | 8 | F Cerúndolo | 6 | 6 | | | | | | | | | | | |
| | G Andreozzi | 3 | 4 | | | F Meligeni Alves | 2 | 3 | | | | | | | | | | | |
| | F Meligeni Alves | 6 | 6 | | | | | | | 8 | F Cerúndolo | 6 | 7 | | | | | | |
| WC | G Heide | 7 | 4 | 6 | | | | | | 3 | JM Cerúndolo | 1 | 5 | | | | | | |
| | JI Londero | 5 | 6 | 4 | WC | G Heide | 1 | 6 | 3 | | | | | | | | | | |
| Alt | M Pucinelli de Almeida | 6 | 5 | 1 | 3 | JM Cerúndolo | 6 | 3 | 6 | | | | | | | | | | |
| 3 | JM Cerúndolo | 4 | 7 | 6 | | | | | | | | | | | 8 | F Cerúndolo | 6 | 1 | 2 |
| 7 | S Báez | 7$^7$ | 6 | | | | | | | | | | | | 7 | S Báez | 4 | 6 | 6 |
| | F Mena | 6$^0$ | 2 | | 7 | S Báez | 6 | 6 | | | | | | | | | | | |
| Q | N Álvarez | 4 | 6 | 6 | Q | N Álvarez | 4 | 3 | | | | | | | | | | | |
| | P Cachin | 6 | 4 | 2 | | | | | | 7 | S Báez | 2 | 7$^7$ | 6 | | | | | |
| Alt | O Luz | 3 | 4 | | | | | | | Q | S Rodríguez Taverna | 6 | 6$^1$ | 1 | | | | | |
| Q | N Álvarez Varona | 6 | 6 | | Q | N Álvarez Varona | 6$^7$ | 7$^7$ | 5 | | | | | | | | | | |
| Q | S Rodríguez Taverna | 6 | 6 | | Q | S Rodríguez Taverna | 7$^9$ | 6$^5$ | 7 | | | | | | | | | | |
| 2 | J Munar | 4 | 3 | | | | | | | | | | | | | | | | |