# 2021 Delray Beach Open – Singles

Reilly Opelka was the defending champion, but withdrew from the event.
Hubert Hurkacz won the title, defeating Sebastian Korda in the final, 6–3, 6–3. Hurkacz did not face an opponent ranked inside the top 100 during his title run.

## Seeds

The top four seeds receive a bye into the second round.
* Cristian Garín (second round)
* John Isner (quarterfinals)
* Adrian Mannarino (second round)
* Hubert Hurkacz (champion)
* Tommy Paul (second round)
* Sam Querrey (second round)
* Pablo Andújar (first round)
* Frances Tiafoe (quarterfinals)

## 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 |
| Q | Christian Harrison | 6$^4$ | 4 | | | | |
| 4 | Hubert Hurkacz | 7$^7$ | 6 | | | | |
| 4 | Hubert Hurkacz | 7$^7$ | 6 | 4 | Hubert Hurkacz | 6 | 6 |
| | | | | | Sebastian Korda | 3 | 3 |
| | Cameron Norrie | 3 | 5 | | Sebastian Korda | 3 | 3 |
| | Sebastian Korda | 6 | 7 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | C Garín | 6$^3$ | 2 | | | | | | | | |
| | TM Etcheverry | 4 | 2 | | Q | C Harrison | 7$^7$ | 6 | | | | | | | | |
| Q | C Harrison | 6 | 6 | | | | | | Q | C Harrison | 7$^7$ | 6 | | | | |
| | G Mager | 3 | 6 | 6 | | | | | | G Mager | 6$^2$ | 4 | | | | |
| WC | R Harrison | 6 | 1 | 4 | | G Mager | 7$^{10}$ | 6 | | | | | | | | |
| | M McDonald | 3 | 4 | | 6 | S Querrey | 6$^8$ | 1 | | | | | | | | |
| 6 | S Querrey | 6 | 6 | | | | | | | | | | Q | C Harrison | 6$^4$ | 4 |
| | | | | | | | | | | | | | 4 | H Hurkacz | 7$^7$ | 6 |
| | | | | | 4 | H Hurkacz | 6 | 6 | | | | | | | | |
| | DE Galán | 6 | 6 | | | DE Galán | 2 | 2 | | | | | | | | |
| | A Martin | 4 | 4 | | | | | | 4 | H Hurkacz | 6 | 6 | | | | |
| WC | N Rubin | 6$^1$ | 3 | | | | | | Q | R Quiroz | 4 | 4 | | | | |
| Q | R Quiroz | 7$^7$ | 6 | | Q | R Quiroz | 6 | 6 | | | | | | | | |
| | I Karlović | 6 | 5 | 6 | | I Karlović | 2 | 4 | | | | | | | | |
| 7 | P Andújar | 3 | 7 | 4 | | | | | | | | | | | | |

### Bottom half

| 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 |
| 8 | F Tiafoe | 6 | 6 | | | | | | | | | | | | | |
| Q | D Young | 3 | 4 | 8 | F Tiafoe | 6 | 3 | 6 | | | | | | | | |
| | B Fratangelo | 6 | 6 | | B Fratangelo | 4 | 6 | 1 | | | | | | | | |
| Q | K King | 2 | 2 | | | | | | 8 | F Tiafoe | 0 | 6 | 4 | | | |
| | C Norrie | 6 | 6 | | | | | | | C Norrie | 6 | 3 | 6 | | | |
| WC | JC Aragone | 2 | 1 | | C Norrie | 6 | 7 | | | | | | | | | |
| | | | | 3 | A Mannarino | 2 | 5 | | | | | | | | | |
| | | | | | | | | | | | | | | C Norrie | 3 | 5 |
| 5 | T Paul | 6 | 6 | | | | | | | | | | | S Korda | 6 | 7 |
| | J-s Nam | 1 | 4 | 5 | T Paul | 6 | 3 | 2 | | | | | | | | |
| | S-w Kwon | 4 | 4 | | S Korda | 4 | 6 | 6 | | | | | | | | |
| | S Korda | 6 | 6 | | | | | | | S Korda | 6 | 4 | 6 | | | |
| | T Bellucci | 3 | 5 | | | | | | 2 | J Isner | 3 | 6 | 3 | | | |
| | T Monteiro | 6 | 7 | | T Monteiro | 4 | 6$^4$ | | | | | | | | | |
| | | | | 2 | J Isner | 6 | 7$^7$ | | | | | | | | | |

## Qualifying
### Seeds

* Marcelo Tomás Barrios Vera (first round)
* Viktor Galović (qualifying competition)
* Gonçalo Oliveira (qualifying competition)
* Pedro Sakamoto (first round)
* Roberto Quiroz (qualified)
* Alexander Ritschard (first round, retired)
* Kevin King (qualified)
* Johannes Härteis (first round, retired)

### Qualifiers

* Christian Harrison
* Roberto Quiroz
* Kevin King
* Donald Young

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Marcelo Tomás Barrios Vera | 4 | 4 | | | | | |
| PR | Christian Harrison | 6 | 6 | | | | | |
| PR | Christian Harrison | 6 | 6 | PR | Christian Harrison | 6 | 6$^9$ | 7$^7$ |
| | | | | WC | Zane Khan | 1 | 7$^{11}$ | 6$^4$ |
| WC | Zane Khan | 6 | 3 | WC | Zane Khan | 1 | 7$^{11}$ | 6$^4$ |
| 6 | Alexander Ritschard | 3 | 1$^r$ | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Viktor Galović | 6 | 6 | | | | | |
| | Aziz Dougaz | 4 | 3 | | | | | |
| | Aziz Dougaz | 4 | 3 | | 2 | Viktor Galović | 3 | 5 |
| | | | | | 5 | Roberto Quiroz | 6 | 7 |
| Alt | Gonzalo Escobar | 4 | 7$^8$ | 5 | 5 | Roberto Quiroz | 6 | 7 |
| 5 | Roberto Quiroz | 6 | 6$^6$ | 7 | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Gonçalo Oliveira | 3 | 6 | 6 | | | | |
| WC | Liam Draxl | 6 | 3 | 2 | | | | |
| WC | Liam Draxl | 6 | 3 | 2 | 3 | Gonçalo Oliveira | 3 | 3 |
| | | | | | 7 | Kevin King | 6 | 6 |
| Alt | Benjamin Lock | 2 | 3 | | 7 | Kevin King | 6 | 6 |
| 7 | Kevin King | 6 | 6 | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Pedro Sakamoto | 6 | 4 | 2 | | | | |
| | Donald Young | 3 | 6 | 6 | | | | |
| | Donald Young | 3 | 6 | 6 | Donald Young | 4 | 6 | 6 |
| | | | | | Stefan Kozlov | 6 | 4 | 4 |
| | Stefan Kozlov | 5 | | | Stefan Kozlov | 6 | 4 | 4 |
| 8 | Johannes Härteis | 0$^r$ | | | | | | |