# 2021 Cary Challenger – Singles

Denis Kudla was the defending champion but chose not to defend his title.
Mitchell Krueger won the title after defeating Ramkumar Ramanathan 7–6$^{(7–4)}$, 6–2 in the final.

## Seeds

* Jenson Brooksby (withdrew)
* Prajnesh Gunneswaran (quarterfinals)
* Maxime Cressy (second round)
* Bjorn Fratangelo (first round)
* Lukáš Lacko (first round)
* Mitchell Krueger (champion)
* Christopher Eubanks (quarterfinals)
* Ramkumar Ramanathan (final)

## 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 |
| 6 | Mitchell Krueger | 6 | 6 | | | | | |
| WC | Govind Nanda | 3 | 2 | | | | | |
| WC | Govind Nanda | 3 | 2 | | 6 | Mitchell Krueger | 7$^7$ | 6 |
| | | | | | 8 | Ramkumar Ramanathan | 6$^4$ | 2 |
| | Stefan Kozlov | 6 | 3 | 1 | 8 | Ramkumar Ramanathan | 6$^4$ | 2 |
| 8 | Ramkumar Ramanathan | 1 | 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 |
| Q | GA Olivieri | 4 | 6 | 7 | | | | | | | | | | | | | | |
| | S Mukund | 6 | 2 | 5 | Q | GA Olivieri | 7$^8$ | 6 | | | | | | | | | | |
| | R Cid Subervi | 3 | 7 | 6 | | R Cid Subervi | 6$^6$ | 0 | | | | | | | | | | |
| | G Villanueva | 6 | 5 | 1 | | | | | | Q | GA Olivieri | 2 | 6 | 3 | | | | |
| Q | S Mochizuki | 4 | 7$^8$ | 4 | | | | | | 6 | M Krueger | 6 | 2 | 6 | | | | |
| LL | A McHugh | 6 | 6$^6$ | 6 | LL | A McHugh | 1 | 6$^2$ | | | | | | | | | | |
| WC | W Blumberg | 6 | 3 | 6$^4$ | 6 | M Krueger | 6 | 7$^7$ | | | | | | | | | | |
| 6 | M Krueger | 4 | 6 | 7$^7$ | | | | | | | | | | | 6 | M Krueger | 6 | 6 |
| 4 | B Fratangelo | 6$^5$ | 6 | 3 | | | | | | | | | | | WC | G Nanda | 3 | 2 |
| | B Schnur | 7$^7$ | 3 | 6 | | B Schnur | 6 | 5 | 5 | | | | | | | | | |
| | R Quiroz | 2 | 3 | | WC | G Nanda | 3 | 7 | 7 | | | | | | | | | |
| WC | G Nanda | 6 | 6 | | | | | | | WC | G Nanda | 2 | 7$^7$ | 6 | | | | |
| | C Harrison | 6 | 6 | | | | | | | | C Harrison | 6 | 6$^2$ | 3 | | | | |
| | Shuichi Sekiguchi | 4 | 4 | | | C Harrison | 7 | 6 | | | | | | | | | | |
| | M Torpegaard | 6 | 6 | | | M Torpegaard | 5 | 2 | | | | | | | | | | |
| 5 | L Lacko | 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 | Semifinals |
| 7 | C Eubanks | 7 | 6 | | | | | | | | | | | | | | | | |
| | P Chrysochos | 5 | 3 | | 7 | C Eubanks | 7$^7$ | 7 | | | | | | | | | | | |
| | J Sock | 2 | 6 | 6 | | J Sock | 6$^4$ | 5 | | | | | | | | | | | |
| | U Blanch | 6 | 4 | 2 | | | | | | 7 | C Eubanks | 7 | 1 | 3 | | | | | |
| | S Kozlov | 4 | 6 | 6 | | | | | | | S Kozlov | 5 | 6 | 6 | | | | | |
| | D Young | 6 | 4 | 4 | | S Kozlov | 3 | 6 | 6 | | | | | | | | | | |
| | N Rubin | 3 | 6$^5$ | | 3 | M Cressy | 6 | 3 | 4 | | | | | | | | | | |
| 3 | M Cressy | 6 | 7$^7$ | | | | | | | | | | | | | S Kozlov | 6 | 3 | 1 |
| 8 | R Ramanathan | 6 | 5 | 6 | | | | | | | | | | | 8 | R Ramanathan | 1 | 6 | 6 |
| Q | A Kovacevic | 4 | 7 | 4 | 8 | R Ramanathan | 7$^7$ | 4 | 6 | | | | | | | | | | |
| PR | J Ward | 6$^1$ | 0 | | Q | A Galarneau | 6$^4$ | 6 | 4 | | | | | | | | | | |
| Q | A Galarneau | 7$^7$ | 6 | | | | | | | 8 | R Ramanathan | 3 | 7$^7$ | 6 | | | | | |
| WC | S Riffice | 6$^3$ | 6 | 7 | | | | | | 2 | P Gunneswaran | 6 | 6$^5$ | 4 | | | | | |
| | T Ito | 7$^7$ | 4 | 5 | WC | S Riffice | 2 | 4 | | | | | | | | | | | |
| | T-S Kwiatkowski | 3 | 2$^r$ | | 2 | P Gunneswaran | 6 | 6 | | | | | | | | | | | |
| 2 | P Gunneswaran | 6 | 3 | | | | | | | | | | | | | | | | |