# 2021 Internazionali di Tennis del Friuli Venezia Giulia – Singles

Bernabé Zapata Miralles was the defending champion but chose not to defend his title.
Francisco Cerúndolo won the title after defeating Tomás Martín Etcheverry 6–1, 6–2 in the final.

## Seeds

* Stefano Travaglia (quarterfinals)
* Gilles Simon (first round)
* Francisco Cerúndolo (champion)
* Juan Pablo Varillas (quarterfinals)
* Hugo Dellien (first round)
* Antoine Hoang (first round)
* Juan Manuel Cerúndolo (first round)
* Federico Gaio (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 | Semifinals | Final | Final | Final | Final |
| | Andrea Collarini | 2 | 6 | 1 | | | | |
| 3 | Francisco Cerúndolo | 6 | 3 | 6 | | | | |
| 3 | Francisco Cerúndolo | 6 | 3 | 6 | 3 | Francisco Cerúndolo | 6 | 6 |
| | | | | | | Tomás Martín Etcheverry | 1 | 2 |
| | Tomás Martín Etcheverry | 6 | 1 | 6 | | Tomás Martín Etcheverry | 1 | 2 |
| | Marc-Andrea Hüsler | 3 | 6 | 3 | | | | |

### 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 | Semifinals |
| 1 | S Travaglia | 6 | 6 | | | | | | | | | | | | | | | | |
| Alt | P Kotov | 1 | 2 | | 1 | S Travaglia | 6$^7$ | 6 | 6 | | | | | | | | | | |
| | Q Halys | 4 | 6$^5$ | | SE | TA Tirante | 7$^9$ | 3 | 4 | | | | | | | | | | |
| SE | TA Tirante | 6 | 7$^7$ | | | | | | | 1 | S Travaglia | 1 | 2 | | | | | | |
| WC | L Nardi | 0 | 3 | | | | | | | | A Collarini | 6 | 6 | | | | | | |
| Q | F Forti | 6 | 6 | | Q | F Forti | 1 | 3 | | | | | | | | | | | |
| | A Collarini | 6 | 7 | | | A Collarini | 6 | 6 | | | | | | | | | | | |
| 6 | A Hoang | 4 | 5 | | | | | | | | | | | | | A Collarini | 2 | 6 | 1 |
| 3 | F Cerúndolo | 6 | 6 | | | | | | | | | | | | 3 | F Cerúndolo | 6 | 3 | 6 |
| Q | A González | 4 | 2 | | 3 | F Cerúndolo | 6 | 6 | | | | | | | | | | | |
| | L Giustino | 6$^2$ | 6 | 6 | | L Giustino | 3 | 3 | | | | | | | | | | | |
| WC | F Baldi | 7$^7$ | 4 | 2 | | | | | | 3 | F Cerúndolo | 6 | 4 | 6 | | | | | |
| | A Pellegrino | 7 | 6$^2$ | 6$^3$ | | | | | | Q | G Zeppieri | 1 | 6 | 3 | | | | | |
| Q | G Zeppieri | 5 | 7$^7$ | 7$^7$ | Q | G Zeppieri | 6 | 6 | | | | | | | | | | | |
| WC | R Bonadio | 6 | 3 | 6 | WC | R Bonadio | 3 | 2 | | | | | | | | | | | |
| 7 | JM Cerúndolo | 0 | 6 | 2 | | | | | | | | | | | | | | | |

### 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 |
| 8 | F Gaio | 6 | 3 | 6 | | | | | | | | | | | | | | |
| | F Meligeni Alves | 3 | 6 | 3 | 8 | F Gaio | 4 | 3 | | | | | | | | | | |
| | TM Etcheverry | 5 | 7$^7$ | 7 | | TM Etcheverry | 6 | 6 | | | | | | | | | | |
| | R Olivo | 7 | 6$^3$ | 5 | | | | | | | TM Etcheverry | 6 | 2 | 7 | | | | |
| | Z Kolář | 6 | 6 | | | | | | | 4 | JP Varillas | 2 | 6 | 5 | | | | |
| | P Lorenzi | 2 | 0 | | | Z Kolář | 3 | 7$^7$ | 6$^2$ | | | | | | | | | |
| | A Tabilo | 4 | 4 | | 4 | JP Varillas | 6 | 6$^5$ | 7$^7$ | | | | | | | | | |
| 4 | JP Varillas | 6 | 6 | | | | | | | | | | | | TM Etcheverry | 6 | 1 | 6 |
| 5 | H Dellien | 6$^4$ | 0 | | | | | | | | | | | | M-A Hüsler | 3 | 6 | 3 |
| Q | C Ugo Carabelli | 7$^7$ | 6 | | Q | C Ugo Carabelli | 4 | 3 | | | | | | | | | | |
| | M-A Hüsler | 6 | 6 | | | M-A Hüsler | 6 | 6 | | | | | | | | | | |
| | R Marcora | 4 | 4 | | | | | | | | M-A Hüsler | 6 | 6$^0$ | 6 | | | | |
| | J Menezes | 6 | 4 | 1 | | | | | | | MT Barrios Vera | 1 | 7$^7$ | 4 | | | | |
| | MT Barrios Vera | 3 | 6 | 6 | | MT Barrios Vera | 6 | 7$^7$ | | | | | | | | | | |
| | GM Moroni | 7$^7$ | 6 | | | GM Moroni | 4 | 6$^5$ | | | | | | | | | | |
| 2 | G Simon | 6$^4$ | 4 | | | | | | | | | | | | | | | |