# 2021 Aspria Tennis Cup – Singles

Hugo Dellien was the defending champion but chose not to defend his title.
Gian Marco Moroni won the title after defeating Federico Coria 6–3, 6–2 in the final.

## Seeds

* Federico Coria (final)
* Holger Rune (semifinals)
* Ulises Blanch (second round)
* Facundo Mena (first round, retired)
* Gastão Elias (quarterfinals)
* Tristan Lamasine (second round)
* Teymuraz Gabashvili (first round)
* Gian Marco Moroni (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 |
| 1 | Federico Coria | 6 | 6 | | | | |
| | Hugo Grenier | 4 | 3 | | | | |
| | Hugo Grenier | 4 | 3 | 1 | Federico Coria | 3 | 2 |
| | | | | 8/WC | Gian Marco Moroni | 6 | 6 |
| 8/WC | Gian Marco Moroni | 7$^7$ | 6 | 8/WC | Gian Marco Moroni | 6 | 6 |
| 2 | Holger Rune | 6$^4$ | 1 | | | | |

### 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 | F Coria | 6 | 6 | | | | | | | | | | | | | | |
| | R Bonadio | 2 | 2 | | 1 | F Coria | 7$^{10}$ | 6 | | | | | | | | | |
| | M Bašić | 6 | 7 | | | M Bašić | 6$^8$ | 3 | | | | | | | | | |
| | V Kopřiva | 3 | 5 | | | | | | | 1 | F Coria | 6 | 6 | | | | |
| | J Lehečka | 6 | 7$^7$ | | | | | | | 5 | G Elias | 2 | 0 | | | | |
| WC | L Vanni | 3 | 6$^5$ | | | J Lehečka | 2 | 4 | | | | | | | | | |
| Q | J Forejtek | 4 | 2 | | 5 | G Elias | 6 | 6 | | | | | | | | | |
| 5 | G Elias | 6 | 6 | | | | | | | | | | | 1 | F Coria | 6 | 6 |
| 4 | F Mena | 0 | 0$^r$ | | | | | | | | | | | | H Grenier | 4 | 3 |
| | P Krstin | 6 | 3 | | | P Krstin | 6 | 0 | 6 | | | | | | | | |
| SE | M Guinard | 4 | 7$^9$ | 5 | SE | M Guinard | 4 | 6 | 4 | | | | | | | | |
| | A Menéndez Maceiras | 6 | 6$^7$ | 1$^r$ | | | | | | | P Krstin | 4 | 4 | | | | |
| | H Grenier | 6 | 6 | | | | | | | | H Grenier | 6 | 6 | | | | |
| | A Vatutin | 3 | 2 | | | H Grenier | 3 | 6 | 7$^7$ | | | | | | | | |
| Q | G Zeppieri | 6 | 7$^7$ | | Q | G Zeppieri | 6 | 3 | 6$^5$ | | | | | | | | |
| 7 | T Gabashvili | 1 | 6$^4$ | | | | | | | | | | | | | | |

### Bottom 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 |
| 8/WC | GM Moroni | 6 | 6 | | | | | | | | | | | | | | |
| PR | V Galović | 2 | 3 | | 8/WC | GM Moroni | 6 | 6 | | | | | | | | | |
| Q | O Luz | 7$^7$ | 4 | 7 | Q | O Luz | 3 | 4 | | | | | | | | | |
| Alt | N Serdarušić | 6$^5$ | 6 | 5 | | | | | 8/WC | GM Moroni | 6 | 7 | | | | | |
| | J Lenz | 1 | 2 | | | | | | Q | D Ajduković | 3 | 5 | | | | | |
| Q | D Ajduković | 6 | 6 | | Q | D Ajduković | 6 | 6 | | | | | | | | | |
| | G García López | 6 | 3 | 2 | 3 | U Blanch | 3 | 1 | | | | | | | | | |
| 3 | U Blanch | 3 | 6 | 6 | | | | | | | | | | 8/WC | GM Moroni | 7$^7$ | 6 |
| 6 | T Lamasine | 3 | 6 | 7 | | | | | | | | | | 2 | H Rune | 6$^4$ | 1 |
| | A Arnaboldi | 6 | 1 | 5 | 6 | T Lamasine | 1 | 4 | | | | | | | | | |
| WC | R Brancaccio | 5 | 3 | | | P Cachin | 6 | 6 | | | | | | | | | |
| | P Cachin | 7 | 6 | | | | | | | P Cachin | 6 | 6$^3$ | 6$^8$ | | | | |
| | E Benchetrit | 4 | 1 | | | | | | 2 | H Rune | 0 | 7$^7$ | 7$^{10}$ | | | | |
| | M Jaziri | 6 | 6 | | | M Jaziri | 3 | 1 | | | | | | | | | |
| | T-l Wu | 6$^4$ | 5 | | 2 | H Rune | 6 | 6 | | | | | | | | | |
| 2 | H Rune | 7$^7$ | 7 | | | | | | | | | | | | | | |