| Singles | |
|---|---|
| 2021 Antalya Challenger IV | |
| Champion |  Evgenii Tiurnev |
| Runner-up |  Oleg Prihodko |
| Score | 3–6, 6–4, 6–4 |
Nuno Borges was the defending champion [1] 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.
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)| Semifinals | Final | ||||||||||||
| LL | Oleg Prihodko | 1 | 6 | 6 | |||||||||
| Giovanni Fonio | 6 | 1 | 3 | ||||||||||
| LL | Oleg Prihodko | 6 | 4 | 4 | |||||||||
| 9 | Evgenii Tiurnev | 3 | 6 | 6 | |||||||||
| 7 | Nerman Fatić | 2 | 7 | 1r | |||||||||
| 9 | Evgenii Tiurnev | 6 | 5 | 4 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1/WC | C İlkel | 6 | 7 | ||||||||||||||||||||||||
| I Nedelko | 4 | 5 | 1/WC | C İlkel | 63 | 6 | 6 | ||||||||||||||||||||
| WC | S Ağabigün | 0 | 5 |  FC Jianu | 77 | 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 | 717 | 6 | LL | O Prihodko | 6 | 6 | ||||||||||||||||||||
| 5 | R Bonadio | 615 | 4 | LL | O Prihodko | 1 | 6 | 6 | |||||||||||||||||||
| 4 | R Peniston | 77 | 77 | G Fonio | 6 | 1 | 3 | ||||||||||||||||||||
 Y-h Hsu | 60 | 60 | 4 | R Peniston | 6 | 4 | 4 | ||||||||||||||||||||
| LL |  J Paul | 1 | 0 | G Fonio | 1 | 6 | 6 | ||||||||||||||||||||
| G Fonio | 6 | 6 | G Fonio | 77 | 6 | ||||||||||||||||||||||
 N Hardt | 7 | 6 | N Hardt | 60 | 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 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | 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 | 1r | ||||||||||||||||||
| 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 | 77 | 1 | ||||||||||||||||||||
| WC | A Jecan | 6 | 77 | 9 | E Tiurnev | 6 | 65 | 6 | |||||||||||||||||||
 N Chappell | 2 | 62 | WC | A Jecan | 3 | 6 | 3 | ||||||||||||||||||||
| Q | Damien Wenger | 2 | 3 | 9 | E Tiurnev | 6 | 4 | 6 | |||||||||||||||||||
| 9 | E Tiurnev | 6 | 6 | ||||||||||||||||||||||||
Andreas Seppi was the defending champion, but he lost in the quarterfinals to Robin Haase.
Robin Haase won the title, defeating Albert Montañés 6–4, 4–6, 6–1 in the final.
Zizou Bergs was the defending champion but lost in the second round to Kacper Żuk.
Albert Ramos Viñolas defeated Cameron Norrie in the final, 4–6, 6–3, 7–6(7–3) to win the singles tennis title at the 2021 Estoril Open. It marked his third career ATP Tour singles title, all of which have been on clay. Norrie was aiming to win his first ATP Tour title in his second final.
Andrej Martin and Hans Podlipnik Castillo were the defending champions but chose not to defend their title.
Tomasz Bednarek and Nikola Mektić were the defending champions but chose not to defend their title.
Aslan Karatsev was the defending champion but chose not to defend his title.
Gerard Granollers and Fabrício Neis were the defending champions but chose not to defend their title.
Carlos Taberner was the defending champion but was not eligible to compete in the tournament due to his ATP ranking.
Pedro Sousa was the defending champion but chose not to defend his title.
Pavel Kotov was the defending champion but chose not to defend his title.
Gastão Elias was the defending champion and successfully defended his title, defeating Nino Serdarušić 6–3, 6–4 in the final.
Marco Bortolotti and Cristian Rodríguez were the defending champions but chose not to defend their title.
The men's singles of the 2022 I.ČLTK Prague Open tournament took place on clay in Prague, Czech Republic.
Antoine Bellier and Gabriel Décamps were the defending champions but chose not to compete.
Pablo Cuevas was the defending champion but chose not to defend his title.
Altuğ Çelikbilek was the defending champion and successfully defended his title after Christopher O'Connell retired at 7–6(7–5), 3–1 down in the final.
Alex Molčan was the defending champion but chose not to defend his title.
Brandon Nakashima was the defending champion but chose not to defend his title.
Evgenii Tiurnev was the defending champion but chose not to defend his title.
Evgeny Karlovskiy and Evgenii Tiurnev were the defending champions but chose not to defend their title.