# 2021 President's Cup – Men's singles

Evgeny Donskoy was the defending champion but chose not to defend his title.
Max Purcell won the title after defeating Jay Clarke 3–6, 6–4, 7–6$^{(8–6)}$ in the final.

## Seeds

* Roman Safiullin (quarterfinals)
* Denis Istomin (first round)
* Jay Clarke (final)
* Max Purcell (champion)
* Borna Gojo (semifinals)
* Sergiy Stakhovsky (second round)
* Peter Polansky (semifinals)
* Hugo Grenier (first 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 | Semifinals | Final | Final | Final | Final | Final |
| 7 | Peter Polansky | 5 | 6 | 6$^3$ | | | | | |
| 4 | Max Purcell | 7 | 3 | 7$^7$ | | | | | |
| 4 | Max Purcell | 7 | 3 | 7$^7$ | 4 | Max Purcell | 3 | 6 | 7$^8$ |
| | | | | | 3 | Jay Clarke | 6 | 4 | 6$^6$ |
| 3 | Jay Clarke | 6 | 6 | | 3 | Jay Clarke | 6 | 4 | 6$^6$ |
| 5 | Borna Gojo | 4 | 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 | Semifinals |
| 1 | R Safiullin | 6 | 6 | | | | | | | | | | | | | | | | |
| | M Jaziri | 4 | 2 | | 1 | R Safiullin | 6 | 6 | | | | | | | | | | | |
| | Y-s Chung | 6 | 6 | | | Y-s Chung | 3 | 4 | | | | | | | | | | | |
| Q | Yan Bondarevskiy | 3 | 4 | | | | | | | 1 | R Safiullin | 2 | 6 | 6$^4$ | | | | | |
| | A Santillan | 4 | 3 | | | | | | | 7 | P Polansky | 6 | 1 | 7$^7$ | | | | | |
| Q | A Kuznetsov | 6 | 6 | | Q | A Kuznetsov | 4 | 3 | | | | | | | | | | | |
| WC | G Lomakin | 4 | 6$^4$ | | 7 | P Polansky | 6 | 6 | | | | | | | | | | | |
| 7 | P Polansky | 6 | 7$^7$ | | | | | | | | | | | | 7 | P Polansky | 5 | 6 | 6$^3$ |
| 4 | M Purcell | 2 | 6 | 7 | | | | | | | | | | | 4 | M Purcell | 7 | 3 | 7$^7$ |
| | A Bega | 6 | 2 | 5 | 4 | M Purcell | 3 | 7$^7$ | 6 | | | | | | | | | | |
| Q | O Krutykh | 3 | 4 | | | T-l Wu | 6 | 6$^4$ | 2 | | | | | | | | | | |
| | T-l Wu | 6 | 6 | | | | | | | 4 | M Purcell | 6 | 6 | | | | | | |
| | L Catarina | 4 | 2 | | | | | | | | Y-h Hsu | 2 | 1 | | | | | | |
| | E Karlovskiy | 6 | 6 | | | E Karlovskiy | 3 | 0 | | | | | | | | | | | |
| | Y-h Hsu | 6 | 6 | | | Y-h Hsu | 6 | 6 | | | | | | | | | | | |
| 8 | H Grenier | 4 | 2 | | | | | | | | | | | | | | | | |

### 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 |
| 6 | S Stakhovsky | 7 | 6 | | | | | | | | | | | | | | | |
| | P Kotov | 5 | 2 | | 6 | S Stakhovsky | 2 | 6 | 2 | | | | | | | | | |
| | J Kubler | 6 | 6 | | | J Kubler | 6 | 3 | 6 | | | | | | | | | |
| WC | Dostanbek Tashbulatov | 1 | 3 | | | | | | | | J Kubler | 6 | 5 | 6$^1$ | | | | |
| WC | B Zhukayev | 4 | 6 | 7$^8$ | | | | | | 3 | J Clarke | 3 | 7 | 7$^7$ | | | | |
| | N Chappell | 6 | 3 | 6$^6$ | WC | B Zhukayev | 3 | 3 | | | | | | | | | | |
| Q | A Dubrivnyy | 5 | 6$^3$ | | 3 | J Clarke | 6 | 6 | | | | | | | | | | |
| 3 | J Clarke | 7 | 7$^7$ | | | | | | | | | | | | 3 | J Clarke | 6 | 6 |
| 5 | B Gojo | 7$^7$ | 6 | | | | | | | | | | | | 5 | B Gojo | 4 | 4 |
| | K Sultanov | 6$^3$ | 1 | | 5 | B Gojo | 6 | 6 | | | | | | | | | | |
| | C Denolly | 2 | 6 | 3 | | C-h Tseng | 1 | 2 | | | | | | | | | | |
| | C-h Tseng | 6 | 3 | 6 | | | | | | 5 | B Gojo | 2 | 7$^7$ | 6 | | | | |
| | M Bašić | 6 | 6 | | | | | | | | M Bašić | 6 | 6$^2$ | 2 | | | | |
| | D Yevseyev | 3 | 3 | | | M Bašić | 6 | 6 | | | | | | | | | | |
| | R Peniston | 6 | 3 | 6 | | R Peniston | 3 | 1 | | | | | | | | | | |
| 2 | D Istomin | 1 | 6 | 3 | | | | | | | | | | | | | | |