# 2021 Maia Challenger – Singles

Pedro Sousa was the defending champion but chose not to defend his title.
Geoffrey Blancaneaux won the title after defeating Tseng Chun-hsin 3–6, 6–3, 6–2 in the final.

## Seeds

* Andrej Martin (semifinals)
* Kimmer Coppejans (quarterfinals)
* Gastão Elias (quarterfinals, withdrew)
* João Domingues (second round)
* Nuno Borges (semifinals)
* Tseng Chun-hsin (final)
* Steven Diez (first round)
* Geoffrey Blancaneaux (champion)

## 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 | Final |
| 1 | Andrej Martin | 4 | 5 | | | | | |
| 6 | Tseng Chun-hsin | 6 | 7 | | | | | |
| 6 | Tseng Chun-hsin | 6 | 7 | 6 | Tseng Chun-hsin | 6 | 3 | 2 |
| | | | | 8 | Geoffrey Blancaneaux | 3 | 6 | 6 |
| 8 | Geoffrey Blancaneaux | 7$^7$ | 6 | 8 | Geoffrey Blancaneaux | 3 | 6 | 6 |
| 5 | Nuno Borges | 6$^3$ | 0 | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | A Martin | 6 | 6 | | | | | | | | | | | | | | | |
| | C Sánchez Jover | 3 | 0 | | 1 | A Martin | 6 | 7$^7$ | | | | | | | | | | |
| Q | Lorenzo Bocchi | 4 | 6 | 6$^3$ | PR | E Benchetrit | 2 | 6$^0$ | | | | | | | | | | |
| PR | E Benchetrit | 6 | 0 | 7$^7$ | | | | | | 1 | A Martin | 6 | 5 | 6 | | | | |
| | L Wessels | 7 | 3 | 6 | | | | | | | L Wessels | 2 | 7 | 4 | | | | |
| Q | Simone Roncalli | 5 | 6 | 3 | | L Wessels | 3 | 6 | 6 | | | | | | | | | |
| | O Roca Batalla | 6 | 6 | | | O Roca Batalla | 6 | 2 | 2 | | | | | | | | | |
| 7 | S Diez | 4 | 1 | | | | | | | | | | | | 1 | A Martin | 4 | 5 |
| 4 | J Domingues | 2 | 7$^7$ | 6 | | | | | | | | | | | 6 | C-h Tseng | 6 | 7 |
| | Matthieu Perchicot | 6 | 6$^2$ | 1 | 4 | J Domingues | 3 | 7$^7$ | 3 | | | | | | | | | |
| WC | Pedro Araújo | 3 | 1 | | | C Hemery | 6 | 6$^5$ | 6 | | | | | | | | | |
| | C Hemery | 6 | 6 | | | | | | | | C Hemery | 4 | 1 | | | | | |
| WC | D Vale | 7$^7$ | 3 | 2 | | | | | | 6 | C-h Tseng | 6 | 6 | | | | | |
| | ND Ionel | 6$^1$ | 6 | 6 | | ND Ionel | 3 | 4 | | | | | | | | | | |
| Q | Oscar Moraing | 4 | 1 | | 6 | C-h Tseng | 6 | 6 | | | | | | | | | | |
| 6 | C-h Tseng | 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 |
| 8 | G Blancaneaux | 6 | 3 | 6 | | | | | | | | | | | | | |
| | N Sánchez Izquierdo | 3 | 6 | 2 | 8 | G Blancaneaux | 2 | 6 | 6 | | | | | | | | |
| | G Oliveira | 6 | 6 | | | G Oliveira | 6 | 3 | 4 | | | | | | | | |
| | M Hamou | 2 | 2 | | | | | | | 8 | G Blancaneaux | w/o | | | | | |
| WC | T Cação | 2 | 6 | 6 | | | | | | 3 | G Elias | | | | | | |
| | D Pichler | 6 | 1 | 4 | WC | T Cação | 2 | 6 | 3 | | | | | | | | |
| | Eduard Esteve Lobato | 4 | 2 | | 3 | G Elias | 6 | 2 | 6 | | | | | | | | |
| 3 | G Elias | 6 | 6 | | | | | | | | | | | 8 | G Blancaneaux | 7$^7$ | 6 |
| 5 | N Borges | 1 | 6 | 6 | | | | | | | | | | 5 | N Borges | 6$^3$ | 0 |
| | Elmar Ejupovic | 6 | 3 | 4 | 5 | N Borges | 7 | 6 | | | | | | | | | |
| | A Dougaz | 6 | 6 | | | A Dougaz | 5 | 1 | | | | | | | | | |
| | I Gakhov | 1 | 4 | | | | | | | 5 | N Borges | 6 | 7$^7$ | | | | |
| PR | J Cagnina | 6 | 6$^5$ | 4 | | | | | | 2 | K Coppejans | 4 | 6$^4$ | | | | |
| Q | Miguel Damas | 0 | 7$^7$ | 6 | Q | M Damas | 2 | 1 | | | | | | | | | |
| | P Jubb | 1 | 1 | | 2 | K Coppejans | 6 | 6 | | | | | | | | | |
| 2 | K Coppejans | 6 | 6 | | | | | | | | | | | | | | |