# 2021 Nottingham Trophy – Men's singles

Marcos Baghdatis was the defending champion but retired from professional tennis in 2019.
Alex Bolt won the title after defeating Kamil Majchrzak 4–6, 6–4, 6–3 in the final.

## Seeds

* Richard Gasquet (quarterfinals, retired)
* Kwon Soon-woo (second round)
* Andreas Seppi (first round)
* Kevin Anderson (first round)
* Mikael Ymer (first round)
* Mikhail Kukushkin (first round)
* Yūichi Sugita (first round)
* Yasutaka Uchiyama (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 | Final | Final | Final | Final | Final |
| Q | Alex Bolt | 6 | 6 | | | | | |
| | Mackenzie McDonald | 3 | 4 | | | | | |
| | Mackenzie McDonald | 3 | 4 | Q | Alex Bolt | 4 | 6 | 6 |
| | | | | | Kamil Majchrzak | 6 | 4 | 3 |
| | Kamil Majchrzak | 6 | 6 | | Kamil Majchrzak | 6 | 4 | 3 |
| | Benjamin Bonzi | 3 | 2 | | | | | |

### 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 | R Gasquet | 6 | 6 | | | | | | | | | | | | | | | |
| Alt | G Soeda | 4 | 2 | | 1 | R Gasquet | 6 | 6 | | | | | | | | | | |
| | M Cressy | 5 | 7$^{10}$ | 6$^4$ | WC | J Clarke | 2 | 3 | | | | | | | | | | |
| WC | J Clarke | 7 | 6$^8$ | 7$^7$ | | | | | | 1 | R Gasquet | 3 | 7$^{11}$ | 0$^r$ | | | | |
| | T Seyboth Wild | 2 | 4 | | | | | | | Q | A Bolt | 6 | 6$^9$ | 1 | | | | |
| Q | A Bolt | 6 | 6 | | Q | A Bolt | 6$^5$ | 6 | 6 | | | | | | | | | |
| WC | A McHugh | 7$^7$ | 6 | | WC | A McHugh | 7$^7$ | 4 | 4 | | | | | | | | | |
| 6 | M Kukushkin | 6$^4$ | 4 | | | | | | | | | | | | Q | A Bolt | 6 | 6 |
| 3 | A Seppi | 6$^1$ | 4 | | | | | | | | | | | | | M McDonald | 3 | 4 |
| LL | Zh Zhang | 7$^7$ | 6 | | LL | Zh Zhang | 4 | 7$^7$ | 4 | | | | | | | | | |
| | M McDonald | 6 | 6 | | | M McDonald | 6 | 6$^3$ | 6 | | | | | | | | | |
| | A Hoang | 4 | 2 | | | | | | | | M McDonald | 6 | 6 | | | | | |
| Alt | T Fabbiano | 4 | 7$^7$ | 6 | | | | | | WC | A Matusevich | 2 | 3 | | | | | |
| | B Nakashima | 6 | 6$^0$ | 3 | Alt | T Fabbiano | 6$^{10}$ | 4 | | | | | | | | | | |
| WC | A Matusevich | 6 | 7 | | WC | A Matusevich | 7$^{12}$ | 6 | | | | | | | | | | |
| 5 | M Ymer | 3 | 5 | | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals |
| 7 | Y Sugita | 0 | 3 | | | | | | | | | | | | | |
| | K Majchrzak | 6 | 6 | | | K Majchrzak | 6 | 6 | | | | | | | | |
| Alt | L Mayer | 6 | 3 | 6$^1$ | Q | R Ramanathan | 4 | 3 | | | | | | | | |
| Q | R Ramanathan | 3 | 6 | 7$^7$ | | | | | | K Majchrzak | 6$^6$ | 6 | 6 | | | |
| | F Gaio | 6 | 7$^9$ | | | | | | | D Kudla | 7$^8$ | 4 | 4 | | | |
| | M Polmans | 4 | 6$^7$ | | | F Gaio | 6 | 3 | 2 | | | | | | | |
| | D Kudla | 7 | 1 | 6 | | D Kudla | 4 | 6 | 6 | | | | | | | |
| 4 | K Anderson | 5 | 6 | 3 | | | | | | | | | | K Majchrzak | 6 | 6 |
| 8 | Y Uchiyama | 6 | 5 | 6$^6$ | | | | | | | | | | B Bonzi | 3 | 2 |
| Q | E Escobedo | 4 | 7 | 7$^8$ | Q | E Escobedo | 6$^{10}$ | 1 | | | | | | | | |
| Q | M Copil | 3 | 4 | | | B Bonzi | 7$^{12}$ | 6 | | | | | | | | |
| | B Bonzi | 6 | 6 | | | | | | | B Bonzi | 7$^7$ | 6 | | | | |
| | D Džumhur | 7$^7$ | 6 | | | | | | | D Džumhur | 6$^1$ | 2 | | | | |
| | E Donskoy | 6$^4$ | 2 | | | D Džumhur | 6 | 6$^3$ | 6 | | | | | | | |
| PR | T Macháč | 6 | 3 | 4 | 2 | S-w Kwon | 4 | 7$^7$ | 2 | | | | | | | |
| 2 | S-w Kwon | 3 | 6 | 6 | | | | | | | | | | | | |