# 2021 Florianópolis Challenger – Singles

This was the first edition of the tournament.
Igor Marcondes won the title after defeating Hugo Dellien 6–2, 6–4 in the final.

## Seeds

* Pablo Cuevas (quarterfinals, retired)
* Hugo Dellien (final)
* Thiago Seyboth Wild (first round)
* Juan Ignacio Londero (semifinals)
* Nicolás Kicker (second round)
* Pedro Cachin (first round)
* Andrea Collarini (first round)
* Juan Pablo Ficovich (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 |
| Q | Igor Marcondes | 7$^7$ | 3 | 6 | | | | |
| 4 | Juan Ignacio Londero | 6$^5$ | 6 | 4 | | | | |
| 4 | Juan Ignacio Londero | 6$^5$ | 6 | 4 | Q | Igor Marcondes | 6 | 6 |
| | | | | | 2 | Hugo Dellien | 2 | 4 |
| | Genaro Alberto Olivieri | 4 | 6 | 3 | 2 | Hugo Dellien | 2 | 4 |
| 2 | Hugo Dellien | 6 | 2 | 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 | Semifinals |
| 1 | P Cuevas | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| | N Álvarez Varona | 6$^3$ | 2 | | 1 | P Cuevas | 6 | 6$^5$ | 6 | | | | | | | | | |
| | A González | 1 | 3 | | Alt | M Zukas | 4 | 7$^7$ | 4 | | | | | | | | | |
| Alt | Matías Zukas | 6 | 6 | | | | | | | 1 | P Cuevas | 6 | 1$^r$ | | | | | |
| | O Luz | 6 | 6$^7$ | 6 | | | | | | Q | I Marcondes | 2 | 4 | | | | | |
| | R Cid Subervi | 4 | 7$^9$ | 3 | | O Luz | 1 | 4 | | | | | | | | | | |
| Q | I Marcondes | 6 | 6 | | Q | I Marcondes | 6 | 6 | | | | | | | | | | |
| 7 | A Collarini | 3 | 3 | | | | | | | | | | | Q | I Marcondes | 7$^7$ | 3 | 6 |
| 4 | JI Londero | 7 | 7 | | | | | | | | | | | 4 | JI Londero | 6$^5$ | 6 | 4 |
| WC | G Heide | 5 | 5 | | 4 | JI Londero | 6 | 6 | | | | | | | | | | |
| | G Clezar | 3 | 7$^7$ | 2 | | J Nikles | 1 | 4 | | | | | | | | | | |
| | J Nikles | 6 | 6$^1$ | 6 | | | | | | 4 | JI Londero | 6 | 6 | | | | | |
| | D Dutra da Silva | 6 | 6 | | | | | | | | D Dutra da Silva | 4 | 3 | | | | | |
| Q | Wilson Leite | 3 | 4 | | | D Dutra da Silva | 2 | 7 | 6 | | | | | | | | | |
| Alt | L Darderi | 5 | 4 | | 5 | N Kicker | 6 | 5 | 4 | | | | | | | | | |
| 5 | N Kicker | 7 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | JP Ficovich | 3 | 0 | | | | | | | | | | | | | | | | |
| Q | N Barrientos | 6 | 6 | | Q | N Barrientos | 7$^7$ | 6 | | | | | | | | | | | |
| WC | P Boscardin Dias | 6 | 5 | 2 | Alt | G Villanueva | 6$^3$ | 1 | | | | | | | | | | | |
| Alt | G Villanueva | 4 | 7 | 6 | | | | | | Q | N Barrientos | 2 | 4 | | | | | | |
| WC | M Alves | 6$^5$ | 4 | | | | | | | | GA Olivieri | 6 | 6 | | | | | | |
| | GA Olivieri | 7$^7$ | 6 | | | GA Olivieri | 6 | 7 | | | | | | | | | | | |
| | M Pucinelli de Almeida | 6 | 6 | | | M Pucinelli de Almeida | 1 | 5 | | | | | | | | | | | |
| 3 | T Seyboth Wild | 4 | 2 | | | | | | | | | | | | | GA Olivieri | 4 | 6 | 3 |
| 6 | P Cachin | 5 | 4 | | | | | | | | | | | | 2 | H Dellien | 6 | 2 | 6 |
| | Facundo Juárez | 7 | 6 | | | F Juárez | 3 | 7 | 6 | | | | | | | | | | |
| | F Díaz Acosta | 6 | 6 | | | F Díaz Acosta | 6 | 5 | 2 | | | | | | | | | | |
| | K Uchida | 4 | 3 | | | | | | | | F Juárez | 6 | 4 | 1 | | | | | |
| | P Krstin | 7 | 1 | 2 | | | | | | 2 | H Dellien | 4 | 6 | 6 | | | | | |
| | H Casanova | 5 | 6 | 6 | | H Casanova | 0 | 3 | | | | | | | | | | | |
| Q | F Zeballos | 6$^0$ | 2 | | 2 | H Dellien | 6 | 6 | | | | | | | | | | | |
| 2 | H Dellien | 7$^7$ | 6 | | | | | | | | | | | | | | | | |