# 2021 Kentucky Bank Tennis Championships – Singles

Jannik Sinner was the defending champion but chose not to defend his title.
Jason Kubler won the title after defeating Alejandro Tabilo 7–5, 6–7$^{(2–7)}$, 7–5 in the final.

## Seeds

* Jenson Brooksby (quarterfinals)
* Alex Bolt (withdrew)
* Maxime Cressy (second round)
* Prajnesh Gunneswaran (first round)
* Emilio Gómez (first round)
* Alejandro Tabilo (final)
* Ernesto Escobedo (semifinals)
* Thanasi Kokkinakis (semifinals)

## 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 |
| 8 | Thanasi Kokkinakis | 6$^3$ | 7$^9$ | 3 | | | | | |
| 6 | Alejandro Tabilo | 7$^7$ | 6$^7$ | 6 | | | | | |
| 6 | Alejandro Tabilo | 7$^7$ | 6$^7$ | 6 | 6 | Alejandro Tabilo | 5 | 7$^7$ | 5 |
| | | | | | | Jason Kubler | 7 | 6$^2$ | 7 |
| 7 | Ernesto Escobedo | 2 | 3 | | | Jason Kubler | 7 | 6$^2$ | 7 |
| | Jason Kubler | 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 | Semifinals |
| 1 | J Brooksby | 6 | 6 | | | | | | | | | | | | | | | | |
| WC | L Draxl | 3 | 3 | | 1 | J Brooksby | 6$^6$ | 6 | | | | | | | | | | | |
| | U Blanch | 6 | 6 | | | U Blanch | 7$^8$ | 5$^r$ | | | | | | | | | | | |
| Alt | Shuichi Sekiguchi | 3 | 4 | | | | | | | 1 | J Brooksby | 4 | 6 | 4 | | | | | |
| LL | E Leshem | 1 | 2 | | | | | | | 8 | T Kokkinakis | 6 | 2 | 6 | | | | | |
| | JP Ficovich | 6 | 6 | | | JP Ficovich | 1 | 6 | 3 | | | | | | | | | | |
| | C Harrison | 5 | 7 | 2 | 8 | T Kokkinakis | 6 | 4 | 6 | | | | | | | | | | |
| 8 | T Kokkinakis | 7 | 5 | 6 | | | | | | | | | | | 8 | T Kokkinakis | 6$^3$ | 7$^9$ | 3 |
| 4 | P Gunneswaran | 3 | 4 | | | | | | | | | | | | 6 | A Tabilo | 7$^7$ | 6$^7$ | 6 |
| | P Polansky | 6 | 6 | | | P Polansky | 4 | 4 | | | | | | | | | | | |
| | T-l Wu | 4 | 0 | | | R Ramanathan | 6 | 6 | | | | | | | | | | | |
| | R Ramanathan | 6 | 6 | | | | | | | | R Ramanathan | 6$^4$ | 4 | | | | | | |
| | C Eubanks | 6$^3$ | 6$^6$ | | | | | | | 6 | A Tabilo | 7$^7$ | 6 | | | | | | |
| Q | S Kozlov | 7$^7$ | 7$^8$ | | Q | S Kozlov | 2 | 2 | | | | | | | | | | | |
| WC | Stefan Dostanic | 2 | 0 | | 6 | A Tabilo | 6 | 6 | | | | | | | | | | | |
| 6 | A Tabilo | 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 |
| 7 | E Escobedo | 6 | 6 | | | | | | | | | | | | | | | |
| WC | G Nanda | 1 | 4 | | 7 | E Escobedo | 6 | 7$^7$ | | | | | | | | | | |
| | R Cid Subervi | 3 | 6 | 6 | | R Cid Subervi | 4 | 6$^1$ | | | | | | | | | | |
| | M Torpegaard | 6 | 4 | 2 | | | | | | 7 | E Escobedo | 7 | 6 | | | | | |
| Q | D King | 6 | 6 | | | | | | | Q | D King | 5 | 0 | | | | | |
| | R Quiroz | 4 | 1 | | Q | D King | 4 | 7$^7$ | 6 | | | | | | | | | |
| | T Ito | 6 | 3 | 4 | 3 | M Cressy | 6 | 6$^2$ | 2 | | | | | | | | | |
| 3 | M Cressy | 4 | 6 | 6 | | | | | | | | | | | 7 | E Escobedo | 2 | 3 |
| 5 | E Gómez | 1 | 6 | 6$^6$ | | | | | | | | | | | | J Kubler | 6 | 6 |
| | J Kubler | 6 | 3 | 7$^8$ | | J Kubler | 6 | 6 | | | | | | | | | | |
| | N Mejía | 6$^3$ | 6 | 1 | Q | A McHugh | 4 | 4 | | | | | | | | | | |
| Q | A McHugh | 7$^7$ | 4 | 6 | | | | | | | J Kubler | 4 | 6 | 7 | | | | |
| Alt | S Mukund | 6 | 6 | | | | | | | Q | GA Olivieri | 6 | 3 | 5 | | | | |
| | B Schnur | 3 | 4 | | Alt | S Mukund | 3 | 3 | | | | | | | | | | |
| | M Krueger | 4 | 4 | | Q | GA Olivieri | 6 | 6 | | | | | | | | | | |
| Q | GA Olivieri | 6 | 6 | | | | | | | | | | | | | | | |