# 2021 Kyiv Open – Singles

This was the first edition of the tournament.
Franco Agamenone won the title after defeating Sebastián Báez 7–5, 6–2 in the final.

## Seeds

* Sebastián Báez (final)
* Frederico Ferreira Silva (first round)
* Quentin Halys (first round)
* Dmitry Popko (quarterfinals, retired)
* Jay Clarke (first round)
* Sergiy Stakhovsky (second round)
* Constant Lestienne (first round)
* Tristan Lamasine (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 | Final | Final | Final | Final |
| 1 | Sebastián Báez | 6 | 6 | | | | |
| Alt | Ergi Kırkın | 3 | 2 | | | | |
| Alt | Ergi Kırkın | 3 | 2 | 1 | Sebastián Báez | 5 | 2 |
| | | | | | Franco Agamenone | 7 | 6 |
| | Timofey Skatov | 6$^4$ | 3 | | Franco Agamenone | 7 | 6 |
| | Franco Agamenone | 7$^7$ | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | S Báez | 6 | 7 | | | | | | | | | | | | | | |
| WC | I Beloborodko | 3 | 5 | | 1 | S Báez | 6 | 6 | | | | | | | | | |
| Q | A Rybakov | 5 | 6 | 6 | Q | A Rybakov | 4 | 2 | | | | | | | | | |
| | A Dougaz | 7 | 0 | 3 | | | | | | 1 | S Báez | 6 | 7 | | | | |
| | FC Jianu | 6 | 6 | | | | | | | | FC Jianu | 3 | 5 | | | | |
| WC | Richard Zusman | 4 | 1 | | | FC Jianu | 7$^7$ | 3 | 6 | | | | | | | | |
| | R Bonadio | 6$^3$ | 7 | 6 | | R Bonadio | 6$^5$ | 6 | 4 | | | | | | | | |
| 7 | C Lestienne | 7$^7$ | 5 | 2 | | | | | | | | | | 1 | S Báez | 6 | 6 |
| 4 | D Popko | 6 | 0 | 6 | | | | | | | | | | Alt | E Kırkın | 3 | 2 |
| Alt | A Bega | 4 | 6 | 2 | 4 | D Popko | 7 | 6 | | | | | | | | | |
| Q | I Gakhov | 1 | 6 | 1 | | F Forti | 5 | 2 | | | | | | | | | |
| | F Forti | 6 | 3 | 6 | | | | | | 4 | D Popko | 4 | 0$^r$ | | | | |
| Q | C Tabur | 4 | 6$^5$ | | | | | | | Alt | E Kırkın | 6 | 1 | | | | |
| Alt | E Kırkın | 6 | 7$^7$ | | Alt | E Kırkın | 4 | 6 | 6 | | | | | | | | |
| | J Sels | 2 | 3 | | 6 | S Stakhovsky | 6 | 3 | 2 | | | | | | | | |
| 6 | S Stakhovsky | 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 |
| 5 | J Clarke | 5 | 2 | | | | | | | | | | | | | | |
| | T Skatov | 7 | 6 | | | T Skatov | 6 | 6 | | | | | | | | | |
| Q | Georgii Kravchenko | 5 | 7 | 6 | Q | G Kravchenko | 2 | 2 | | | | | | | | | |
| PR | J De Loore | 7 | 5 | 3 | | | | | | | T Skatov | 6$^5$ | 6 | 6 | | | |
| | M Pucinelli de Almeida | 6 | 6 | | | | | | | | N Borges | 7$^7$ | 4 | 4 | | | |
| | M Vrbenský | 3 | 2 | | | M Pucinelli de Almeida | 6 | 2 | 5 | | | | | | | | |
| | N Borges | 6 | 7 | | | N Borges | 2 | 6 | 7 | | | | | | | | |
| 3 | Q Halys | 3 | 5 | | | | | | | | | | | | T Skatov | 6$^4$ | 3 |
| 8 | T Lamasine | 7$^8$ | 6 | | | | | | | | | | | | F Agamenone | 7$^7$ | 6 |
| | K Uchida | 6$^6$ | 2 | | 8 | T Lamasine | 6 | 2 | 4 | | | | | | | | |
| | F Agamenone | 6 | 7 | | | F Agamenone | 3 | 6 | 6 | | | | | | | | |
| | S Kozlov | 4 | 5 | | | | | | | | F Agamenone | 6 | 6 | | | | |
| | N Chappell | 3 | 6 | 1 | | | | | | WC | O Krutykh | 2 | 3 | | | | |
| WC | O Krutykh | 6 | 3 | 6 | WC | O Krutykh | 6 | 3 | 6 | | | | | | | | |
| | O Luz | 5 | 6 | 7$^7$ | | O Luz | 2 | 6 | 3 | | | | | | | | |
| 2 | F Ferreira Silva | 7 | 2 | 6$^5$ | | | | | | | | | | | | | |