# 2021 Antalya Challenger IV – Singles

Nuno Borges was the defending champion but chose not to defend his title.
Evgenii Tiurnev won the title after defeating Oleg Prihodko 3–6, 6–4, 6–4 in the final.

## Seeds

* Cem İlkel (quarterfinals)
* Ramkumar Ramanathan (withdrew)
* Duje Ajduković (quarterfinals)
* Ryan Peniston (second round)
* Riccardo Bonadio (first round)
* Javier Barranco Cosano (second round)
* Nerman Fatić (semifinals, retired)
* Miljan Zekić (withdrew)
* Evgenii Tiurnev (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 | Semifinals | Final | Final | Final | Final | Final |
| LL | Oleg Prihodko | 1 | 6 | 6 | | | | | |
| | Giovanni Fonio | 6 | 1 | 3 | | | | | |
| | Giovanni Fonio | 6 | 1 | 3 | LL | Oleg Prihodko | 6 | 4 | 4 |
| | | | | | 9 | Evgenii Tiurnev | 3 | 6 | 6 |
| 7 | Nerman Fatić | 2 | 7 | 1$^r$ | 9 | Evgenii Tiurnev | 3 | 6 | 6 |
| 9 | Evgenii Tiurnev | 6 | 5 | 4 | | | | | |

### Top half

| 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/WC | C İlkel | 6 | 7 | | | | | | | | | | | | | | | |
| | I Nedelko | 4 | 5 | 1/WC | C İlkel | 6$^3$ | 6 | 6 | | | | | | | | | | |
| WC | S Ağabigün | 0 | 5 | | FC Jianu | 7$^7$ | 4 | 0 | | | | | | | | | | |
| | FC Jianu | 6 | 7 | | | | | | 1/WC | C İlkel | 3 | 6 | 2 | | | | | |
| | D-h Lee | 6 | 6 | | | | | | LL | O Prihodko | 6 | 3 | 6 | | | | | |
| | F Marozsán | 4 | 1 | | D-h Lee | 3 | 3 | | | | | | | | | | | |
| LL | O Prihodko | 7$^{17}$ | 6 | LL | O Prihodko | 6 | 6 | | | | | | | | | | | |
| 5 | R Bonadio | 6$^{15}$ | 4 | | | | | | | | | | | LL | O Prihodko | 1 | 6 | 6 |
| 4 | R Peniston | 7$^7$ | 7$^7$ | | | | | | | | | | | | G Fonio | 6 | 1 | 3 |
| | Y-h Hsu | 6$^0$ | 6$^0$ | 4 | R Peniston | 6 | 4 | 4 | | | | | | | | | | |
| LL | J Paul | 1 | 0 | | G Fonio | 1 | 6 | 6 | | | | | | | | | | |
| | G Fonio | 6 | 6 | | | | | | | G Fonio | 7$^7$ | 6 | | | | | | |
| | N Hardt | 7 | 6 | | | | | | | N Hardt | 6$^0$ | 2 | | | | | | |
| | O Krutykh | 5 | 3 | | N Hardt | 5 | 6 | 6 | | | | | | | | | | |
| | F Misolic | 3 | 3 | 6 | J Barranco Cosano | 7 | 0 | 2 | | | | | | | | | | |
| 6 | J Barranco Cosano | 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 | Semifinals |
| 7 | N Fatić | 2 | 6 | 6 | | | | | | | | | | | | | | | |
| | Pol Martín Tiffon | 6 | 0 | 0 | 7 | N Fatić | w/o | | | | | | | | | | | | |
| | Georgii Kravchenko | 4 | 1 | | | V Orlov | | | | | | | | | | | | | |
| | V Orlov | 6 | 6 | | | | | | | 7 | N Fatić | 6 | 7 | | | | | | |
| | K Sultanov | 3 | 3 | | | | | | | 3 | D Ajduković | 4 | 5 | | | | | | |
| Q | C Crețu | 6 | 6 | | Q | C Crețu | 6 | 4 | 4 | | | | | | | | | | |
| | Y Oliel | 4 | 6 | 4 | 3 | D Ajduković | 4 | 6 | 6 | | | | | | | | | | |
| 3 | D Ajduković | 6 | 1 | 6 | | | | | | | | | | | 7 | N Fatić | 2 | 7 | 1$^r$ |
| LL | G Lomakin | 5 | 4 | | | | | | | | | | | | 9 | E Tiurnev | 6 | 5 | 4 |
| Q | Andrey Chepelev | 7 | 6 | | Q | A Chepelev | 2 | 0 | | | | | | | | | | | |
| | A Lazarov | 6 | 6 | | | A Lazarov | 6 | 6 | | | | | | | | | | | |
| Q | M İlhan | 3 | 3 | | | | | | | | A Lazarov | 4 | 7$^7$ | 1 | | | | | |
| WC | A Jecan | 6 | 7$^7$ | | | | | | | 9 | E Tiurnev | 6 | 6$^5$ | 6 | | | | | |
| | N Chappell | 2 | 6$^2$ | | WC | A Jecan | 3 | 6 | 3 | | | | | | | | | | |
| Q | D Wenger | 2 | 3 | | 9 | E Tiurnev | 6 | 4 | 6 | | | | | | | | | | |
| 9 | E Tiurnev | 6 | 6 | | | | | | | | | | | | | | | | |