title: 2021 Amex-Istanbul Challenger – Singles
text: # 2021 Amex-Istanbul Challenger – Singles
  
  Ilya Ivashka was the defending champion but chose not to defend his title.
  
  Arthur Rinderknech won the title after defeating Benjamin Bonzi 4–6, $7–6^{(7–1)},$ $7–6^{(7–3)}$ in the final.
  
  ## Seeds
  
  * Daniel Elahi Galán (first round)
  * Thiago Seyboth Wild (first round)
  * Antoine Hoang (quarterfinals)
  * Facundo Bagnis (second round)
  * Prajnesh Gunneswaran (first round, retired)
  * Lorenzo Musetti (second round)
  * Jozef Kovalík (semifinals)
  * Go Soeda (quarterfinals, withdrew)
  
  ## 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 | Final |
  | - | - | - | - | - | - | - | - | - |
  | 7 | Jozef Kovalík | 5 | 4 | | | | | |
  | Q | Arthur Rinderknech | 7 | 6 | | | | | |
  | Q | Arthur Rinderknech | 7 | 6 | Q | Arthur Rinderknech | 4 | $7^7$ | $7^7$ |
  | | | | | | Benjamin Bonzi | 6 | $6^1$ | $6^3$ |
  | | Benjamin Bonzi | $7^7$ | 6 | | Benjamin Bonzi | 6 | $6^1$ | $6^3$ |
  | | Mohamed Safwat | $6^1$ | 4 | | | | | |
  
  ### 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 | DE Galán | $6^5$ | 3 | | | | | | | | | | | | | | | |
  | Q | J Menezes | $7^7$ | 6 | | Q | J Menezes | 2 | $6^5$ | | | | | | | | | | |
  | WC | E Kırkın | 6 | 6 | | WC | E Kırkın | 6 | $7^7$ | | | | | | | | | | |
  | | P Lorenzi | 4 | 2 | | | | | | | WC | E Kırkın | $7^7$ | 0 | $6^3$ | | | | |
  | | B Zapata Miralles | 4 | 2 | | | | | | | 7 | J Kovalík | $6^5$ | 6 | $7^7$ | | | | |
  | | C Taberner | 6 | 6 | | | C Taberner | $6^4$ | 0 | | | | | | | | | | |
  | WC | A Çelikbilek | 5 | 6 | 4 | 7 | J Kovalík | $7^7$ | 6 | | | | | | | | | | |
  | 7 | J Kovalík | 7 | 2 | 6 | | | | | | | | | | | 7 | J Kovalík | 5 | 4 |
  | 4 | F Bagnis | 6 | 6 | | | | | | | | | | | | Q | A Rinderknech | 7 | 6 |
  | | Zh Zhang | 4 | 1 | | 4 | F Bagnis | 5 | 2 | | | | | | | | | | |
  | | M-A Hüsler | 2 | 6 | 6 | | M-A Hüsler | 7 | 6 | | | | | | | | | | |
  | LL | D Istomin | 6 | 2 | 4 | | | | | | | M-A Hüsler | 5 | 3 | | | | | |
  | | B Nakashima | 3 | 6 | 6 | | | | | | Q | A Rinderknech | 7 | 6 | | | | | |
  | WC | C İlkel | 6 | 4 | 3 | | B Nakashima | $7^9$ | 1 | 4 | | | | | | | | | |
  | Q | A Rinderknech | 6 | 3 | | Q | A Rinderknech | $6^7$ | 6 | 6 | | | | | | | | | |
  | 5 | P Gunneswaran | 4 | $2^r$ | | | | | | | | | | | | | | | |
  
  ### 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 |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | 6 | L Musetti | 6 | $7^8$ | | | | | | | | | | | | | | |
  | | D Petrović | 4 | $6^6$ | | 6 | L Musetti | 1 | 4 | | | | | | | | | |
  | | B Rola | 4 | $1^r$ | | | B Bonzi | 6 | 6 | | | | | | | | | |
  | | B Bonzi | 6 | 2 | | | | | | | | B Bonzi | $6^5$ | 6 | 7 | | | |
  | | L Giustino | 7 | $7^7$ | | | | | | | 3 | A Hoang | $7^7$ | 1 | 5 | | | |
  | | A Giannessi | 5 | $6^5$ | | | L Giustino | 4 | 4 | | | | | | | | | |
  | | E Gómez | $7^7$ | 2 | 4 | 3 | A Hoang | 6 | 6 | | | | | | | | | |
  | 3 | A Hoang | $6^3$ | 6 | 6 | | | | | | | | | | | B Bonzi | $7^7$ | 6 |
  | 8 | G Soeda | 6 | 6 | | | | | | | | | | | | M Safwat | $6^1$ | 4 |
  | | A Tabilo | 3 | 3 | | 8 | G Soeda | 7 | 4 | $7^7$ | | | | | | | | |
  | Q | L Rosol | 4 | $6^3$ | | | T Griekspoor | 5 | 6 | $6^2$ | | | | | | | | |
  | | T Griekspoor | 6 | $7^7$ | | | | | | | 8 | G Soeda | | | | | | |
  | Q | J Clarke | 3 | 5 | | | | | | | | M Safwat | w/o | | | | | |
  | | F Gaio | 6 | 7 | | | F Gaio | $6^4$ | 5 | | | | | | | | | |
  | | M Safwat | 6 | 6 | | | M Safwat | $7^7$ | 7 | | | | | | | | | |
  | 2 | T Seyboth Wild | 4 | 1 | | | | | | | | | | | | | | |
  