# 2021 Atlanta Open – Singles

Alex de Minaur was the reigning champion from when the tournament was last held in 2019, but chose not to participate this year.
John Isner won his sixth Atlanta Open title, defeating Brandon Nakashima in the final, 7–6$^{(10–8)}$, 7–5.

## Seeds

The top four seeds receive a bye into the second round.
* Milos Raonic (second round)
* Jannik Sinner (second round)
* Cameron Norrie (quarterfinals)
* Reilly Opelka (quarterfinals)
* Taylor Fritz (semifinals)
* John Isner (champion)
* Benoît Paire (second round, retired)
* Lloyd Harris (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 |
| SE | Brandon Nakashima | 3 | 6 | 6 | | | | |
| | Emil Ruusuvuori | 6 | 4 | 3 | | | | |
| | Emil Ruusuvuori | 6 | 4 | 3 | SE | Brandon Nakashima | 6$^8$ | 5 |
| | | | | | 6 | John Isner | 7$^{10}$ | 7 |
| 5 | Taylor Fritz | 6$^4$ | 7 | 3 | 6 | John Isner | 7$^{10}$ | 7 |
| 6 | John Isner | 7$^7$ | 5 | 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 | Semifinals |
| | | | | | 1/WC | M Raonic | 7 | 3 | 6$^4$ | | | | | | | | | |
| WC | T Bryde | 1 | 7$^7$ | 4 | SE | B Nakashima | 5 | 6 | 7$^7$ | | | | | | | | | |
| SE | B Nakashima | 6 | 6$^5$ | 6 | | | | | | SE | B Nakashima | 7$^7$ | 7 | | | | | |
| Q | P Gojowczyk | 4 | 7$^7$ | 7$^7$ | | | | | | | J Thompson | 6$^5$ | 5 | | | | | |
| | S Querrey | 6 | 6$^3$ | 6$^5$ | Q | P Gojowczyk | 6$^6$ | 4 | | | | | | | | | | |
| | J Thompson | 7$^7$ | 1 | 6 | | J Thompson | 7$^8$ | 6 | | | | | | | | | | |
| 8 | L Harris | 6$^2$ | 6 | 2 | | | | | | | | | | SE | B Nakashima | 3 | 6 | 6 |
| | | | | | | | | | | | | | | | E Ruusuvuori | 6 | 4 | 3 |
| | | | | | 3 | C Norrie | 6 | 6 | | | | | | | | | | |
| | K Anderson | 6$^4$ | 3 | | | N Kyrgios | 1 | 4 | | | | | | | | | | |
| | N Kyrgios | 7$^7$ | 6 | | | | | | | 3 | C Norrie | 6$^1$ | 3 | | | | | |
| | M McDonald | 6$^3$ | 5 | | | | | | | | E Ruusuvuori | 7$^7$ | 6 | | | | | |
| | E Ruusuvuori | 7$^7$ | 7 | | | E Ruusuvuori | 4 | 6 | 3 | | | | | | | | | |
| | Y Uchiyama | 5 | 7$^7$ | 4 | 7 | B Paire | 6 | 4 | 0$^r$ | | | | | | | | | |
| 7 | B Paire | 7 | 6$^2$ | 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 | Semifinals |
| 5 | T Fritz | 6 | 6 | | | | | | | | | | | | | | | | |
| Q | E Donskoy | 3 | 4 | | 5 | T Fritz | 6$^5$ | 6 | 6 | | | | | | | | | | |
| | A Popyrin | 6$^4$ | 3 | | | S Johnson | 7$^7$ | 4 | 1 | | | | | | | | | | |
| | S Johnson | 7$^7$ | 6 | | | | | | | 5 | T Fritz | 7$^7$ | 6$^3$ | 7$^7$ | | | | | |
| | A Seppi | 5 | 6$^5$ | | | | | | | 4 | R Opelka | 6$^5$ | 7$^7$ | 6$^4$ | | | | | |
| Q | B Fratangelo | 7 | 7$^7$ | | Q | B Fratangelo | 6$^3$ | 6$^4$ | | | | | | | | | | | |
| | | | | | 4 | R Opelka | 7$^7$ | 7$^7$ | | | | | | | | | | | |
| | | | | | | | | | | | | | | | 5 | T Fritz | 6$^4$ | 7 | 3 |
| 6 | J Isner | 6 | 6$^3$ | 6 | | | | | | | | | | | 6 | J Isner | 7$^7$ | 5 | 6 |
| PR | J. J. Wolf | 4 | 7$^7$ | 4 | 6 | J Isner | 7$^8$ | 6 | | | | | | | | | | | |
| WC | J Sock | 6$^4$ | 6 | 7 | WC | J Sock | 6$^6$ | 4 | | | | | | | | | | | |
| | R Berankis | 7$^7$ | 4 | 5 | | | | | | 6 | J Isner | 7$^7$ | 6$^3$ | 6 | | | | | |
| Q | C O'Connell | 4 | 6 | 6 | | | | | | Q | C O'Connell | 6$^5$ | 7$^7$ | 4 | | | | | |
| | D Kudla | 6 | 3 | 3 | Q | C O'Connell | 7$^9$ | 6 | | | | | | | | | | | |
| | | | | | 2 | J Sinner | 6$^7$ | 4 | | | | | | | | | | | |

## Qualifying
### Seeds

* Peter Gojowczyk (qualified)
* Christopher O'Connell (qualified)
* Evgeny Donskoy (qualified)
* Jason Jung (qualifying competition)
* Illya Marchenko (first round)
* Sebastian Ofner (qualifying competition, retired)
* Elias Ymer (first round)
* Go Soeda (first round)

### Qualifiers

* Peter Gojowczyk
* Christopher O'Connell
* Evgeny Donskoy
* Bjorn Fratangelo

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Peter Gojowczyk | 6 | 6 | | | | |
| WC | Donald Young | 4 | 1 | | | | |
| WC | Donald Young | 4 | 1 | 1 | Peter Gojowczyk | 6 | 6 |
| | | | | Alt | James Ward | 2 | 4 |
| Alt | James Ward | 6 | 7$^7$ | Alt | James Ward | 2 | 4 |
| 5 | Illya Marchenko | 3 | 6$^1$ | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Christopher O'Connell | 7 | 6 | | | |
| | Yosuke Watanuki | 5 | 4 | | | |
| | Yosuke Watanuki | 5 | 4 | 2 | Christopher O'Connell | 4 |
| | | | | 6 | Sebastian Ofner | 2$^r$ |
| WC | Samir Banerjee | 5 | 4 | 6 | Sebastian Ofner | 2$^r$ |
| 6 | Sebastian Ofner | 7 | 6 | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Evgeny Donskoy | 3 | 6 | 6 | | | | |
| | Noah Rubin | 6 | 3 | 4 | | | | |
| | Noah Rubin | 6 | 3 | 4 | 3 | Evgeny Donskoy | 6 | 6 |
| | | | | | | Matthew Ebden | 4 | 4 |
| | Matthew Ebden | 6 | 7$^7$ | | | Matthew Ebden | 4 | 4 |
| 8 | Go Soeda | 3 | 6$^4$ | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Jason Jung | 6 | 6$^4$ | 6 | | | | | |
| | Lukáš Lacko | 4 | 7$^7$ | 3 | | | | | |
| | Lukáš Lacko | 4 | 7$^7$ | 3 | 4 | Jason Jung | 3 | 6 | 5 |
| | | | | | | Bjorn Fratangelo | 6 | 1 | 7 |
| | Bjorn Fratangelo | 7$^7$ | 6 | | | Bjorn Fratangelo | 6 | 1 | 7 |
| 7 | Elias Ymer | 6$^5$ | 3 | | | | | | |