2021 Lošinj Open – Singles
# 2021 Lošinj Open – Singles

This was the first edition of the tournament.

Carlos Taberner won the title by walkover after Marco Cecchinato withdrew before the final.

## Seeds

* Marco Cecchinato (final, withdrew)
* Carlos Taberner (champion)
* Andrej Martin (second round)
* Nikola Milojević (first round)
* Blaž Rola (first round)
* Alessandro Giannessi (semifinals)
* Jay Clarke (first round)
* Mathias Bourgue (quarterfinals)

## 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 |
| - | - | - | - | - | - | - |
| 1 | Marco Cecchinato | 6 | $7^7$ | | | |
| | Nerman Fatić | 3 | $6^4$ | | | |
| | Nerman Fatić | 3 | $6^4$ | 1 | Marco Cecchinato | |
| | | | | 2 | Carlos Taberner | w/o |
| 6 | Alessandro Giannessi | 4 | 3 | 2 | Carlos Taberner | w/o |
| 2 | Carlos Taberner | 6 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | M Cecchinato | $7^7$ | $7^7$ | | | | | | | | | | | | | | | |
| Alt | Á López San Martín | $6^5$ | $6^2$ | | 1 | M Cecchinato | $6^4$ | $7^7$ | 6 | | | | | | | | | |
| | M Guinard | 6 | 3 | 4 | | N Serdarušić | $7^7$ | $6^4$ | 1 | | | | | | | | | |
| | N Serdarušić | 2 | 6 | 6 | | | | | | 1 | M Cecchinato | 6 | 2 | 7 | | | | |
| Alt | A Šetkić | 6 | 6 | | | | | | | 8 | M Bourgue | 0 | 6 | 5 | | | | |
| WC | Anthony Genov | 3 | 4 | | Alt | A Šetkić | 0 | 2 | | | | | | | | | | |
| | D Petrović | $2^r$ | | | 8 | M Bourgue | 6 | 6 | | | | | | | | | | |
| 8 | M Bourgue | 5 | | | | | | | | | | | | | 1 | M Cecchinato | 6 | $7^7$ |
| 3 | A Martin | $7^7$ | 6 | | | | | | | | | | | | | N Fatić | 3 | $6^4$ |
| WC | M Poljičak | $6^2$ | 3 | | 3 | A Martin | 1 | $6^{11}$ | | | | | | | | | | |
| Q | F Misolic | 6 | 6 | | Q | F Misolic | 6 | $7^{13}$ | | | | | | | | | | |
| Q | A Kadhe | 1 | 2 | | | | | | | Q | F Misolic | $6^6$ | 2 | | | | | |
| Q | N Álvarez Varona | 5 | 2 | | | | | | | | N Fatić | $7^8$ | 6 | | | | | |
| | N Fatić | 7 | 6 | | | N Fatić | 6 | 2 | 6 | | | | | | | | | |
| Q | Georgii Kravchenko | 6 | 6 | | Q | G Kravchenko | 3 | 6 | 3 | | | | | | | | | |
| 5 | B Rola | 4 | 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 |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 6 | A Giannessi | $7^7$ | 7 | | | | | | | | | | | | | | | |
| | R Haase | $6^4$ | 5 | | 6 | A Giannessi | $7^9$ | 3 | 6 | | | | | | | | | |
| | D Ajduković | $6^2$ | 0 | | | F Agamenone | $6^7$ | 6 | 1 | | | | | | | | | |
| | F Agamenone | $7^7$ | 6 | | | | | | | 6 | A Giannessi | 6 | $6^6$ | 6 | | | | |
| Alt | R Brancaccio | 6 | 3 | 6 | | | | | | Alt | R Brancaccio | 3 | $7^8$ | 1 | | | | |
| | E Kırkın | 3 | 6 | 2 | Alt | R Brancaccio | 6 | 6 | | | | | | | | | | |
| | C Gimeno Valero | 6 | 6 | | | C Gimeno Valero | 4 | 1 | | | | | | | | | | |
| 4 | N Milojević | 3 | 1 | | | | | | | | | | | | 6 | A Giannessi | 4 | 3 |
| 7 | J Clarke | 3 | 6 | 3 | | | | | | | | | | | 2 | C Taberner | 6 | 6 |
| | A Arnaboldi | 6 | 3 | 6 | | A Arnaboldi | 6 | 3 | 6 | | | | | | | | | |
| | J Forejtek | 6 | 6 | | | J Forejtek | 3 | 6 | 4 | | | | | | | | | |
| WC | VV Cornea | 4 | 4 | | | | | | | | A Arnaboldi | 2 | 0 | | | | | |
| | G Blancaneaux | 6 | 6 | | | | | | | 2 | C Taberner | 6 | 6 | | | | | |
| | FC Jianu | 2 | 3 | | | G Blancaneaux | $6^1$ | 6 | 1 | | | | | | | | | |
| | J Barranco Cosano | 4 | 3 | | 2 | C Taberner | $7^7$ | 3 | 6 | | | | | | | | | |
| 2 | C Taberner | 6 | 6 | | | | | | | | | | | | | | | |
