# 2021 Maia Challenger II – Singles

Geoffrey Blancaneaux was the defending champion but chose not to defend his title.
Tseng Chun-hsin won the title after defeating Nuno Borges 5–7, 7–5, 6–2 in the final.

## Seeds

* Andrej Martin (semifinals)
* Kimmer Coppejans (second round)
* Maxime Janvier (first round)
* Gastão Elias (second round)
* Nuno Borges (final)
* João Domingues (first round)
* Tseng Chun-hsin (champion)
* Gonçalo Oliveira (second 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 | Final | Final | Final | Final | Final |
| 1 | Andrej Martin | 1 | 2 | | | | | |
| 7 | Tseng Chun-hsin | 6 | 6 | | | | | |
| 7 | Tseng Chun-hsin | 6 | 6 | 7 | Tseng Chun-hsin | 5 | 7 | 6 |
| | | | | 5 | Nuno Borges | 7 | 5 | 2 |
| 5 | Nuno Borges | 6 | 6 | 5 | Nuno Borges | 7 | 5 | 2 |
| Alt | Elliot Benchetrit | 2 | 2 | | | | | |

### 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 |
| 1 | A Martin | 7$^7$ | 6$^5$ | 7 | | | | | | | | | | | | | |
| Q | D Wenger | 6$^1$ | 7$^7$ | 5 | 1 | A Martin | w/o | | | | | | | | | | |
| | L Wessels | 4 | 6 | 6$^5$ | Q | L Potenza | | | | | | | | | | | |
| Q | Luca Potenza | 6 | 2 | 7$^7$ | | | | | | 1 | A Martin | 6 | 6 | | | | |
| | S Fanselow | 6 | 3 | 6 | | | | | | | S Fanselow | 2 | 2 | | | | |
| WC | Fábio Coelho | 3 | 6 | 3 | | S Fanselow | 7$^7$ | 6 | | | | | | | | | |
| | G Melzer | 6 | 4 | 6$^3$ | 8 | G Oliveira | 6$^3$ | 4 | | | | | | | | | |
| 8 | G Oliveira | 4 | 6 | 7$^7$ | | | | | | | | | | 1 | A Martin | 1 | 2 |
| 3 | M Janvier | 6$^5$ | 2 | | | | | | | | | | | 7 | C-h Tseng | 6 | 6 |
| | FC Jianu | 7$^7$ | 6 | | | FC Jianu | 7 | 3 | 4 | | | | | | | | |
| | Eduard Esteve Lobato | 6 | 6 | | | E Esteve Lobato | 5 | 6 | 6 | | | | | | | | |
| SE | O Prihodko | 3 | 2 | | | | | | | | E Esteve Lobato | 1 | 5 | | | | |
| | A Erler | 1 | 2 | | | | | | | 7 | C-h Tseng | 6 | 7 | | | | |
| | F Marozsán | 6 | 6 | | | F Marozsán | 6$^4$ | 3 | | | | | | | | | |
| | M Viola | 3 | 4 | | 7 | C-h Tseng | 7$^7$ | 6 | | | | | | | | | |
| 7 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | N Borges | 7$^{10}$ | 6 | | | | | | | | | | | | | | | |
| | R Bonadio | 6$^8$ | 2 | | 5 | N Borges | 6 | 6 | | | | | | | | | | |
| Q | Edoardo Lavagno | 6 | 2 | 7$^8$ | Q | E Lavagno | 3 | 2 | | | | | | | | | | |
| WC | T Cação | 1 | 6 | 6$^6$ | | | | | | 5 | N Borges | 6 | 6 | | | | | |
| | J Barranco Cosano | 4 | 6 | 4 | | | | | | | N Sánchez Izquierdo | 4 | 4 | | | | | |
| | N Sánchez Izquierdo | 6 | 4 | 6 | | N Sánchez Izquierdo | 6 | 6$^5$ | 6 | | | | | | | | | |
| Alt | O Krutykh | 6 | 2 | 5 | 4 | G Elias | 1 | 7$^7$ | 3 | | | | | | | | | |
| 4 | G Elias | 4 | 6 | 7 | | | | | | | | | | | 5 | N Borges | 6 | 6 |
| 6 | J Domingues | 3 | 7 | 3 | | | | | | | | | | | Alt | E Benchetrit | 2 | 2 |
| | N Hardt | 6 | 5 | 6 | | N Hardt | 3 | 4 | | | | | | | | | | |
| | Alexis Gautier | 2 | 2 | | Alt | E Benchetrit | 6 | 6 | | | | | | | | | | |
| Alt | E Benchetrit | 6 | 6 | | | | | | | Alt | E Benchetrit | 5 | 6 | 6 | | | | |
| Q | Elmar Ejupovic | 6 | 6 | | | | | | | Q | E Ejupovic | 7 | 1 | 4 | | | | |
| Alt | O Roca Batalla | 4 | 4 | | Q | E Ejupovic | 6 | 6 | | | | | | | | | | |
| WC | Pedro Araújo | 4 | 6 | 3 | 2 | K Coppejans | 4 | 4 | | | | | | | | | | |
| 2 | K Coppejans | 6 | 4 | 6 | | | | | | | | | | | | | | |