# 2021 Challenger Eckental – Singles

Sebastian Korda was the defending champion but chose not to defend his title.
Daniel Masur won the title after defeating Maxime Cressy 6–4, 6–4 in the final.

## Seeds

* Jordan Thompson (quarterfinals)
* Jiří Veselý (quarterfinals)
* Jurij Rodionov (first round)
* Oscar Otte (first round)
* Tomáš Macháč (semifinals)
* Maxime Cressy (final)
* Mats Moraing (withdrew)
* Kacper Żuk (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 |
| | Marc-Andrea Hüsler | 2 | 3 | | | | | |
| | Daniel Masur | 6 | 6 | | | | | |
| | Daniel Masur | 6 | 6 | | | Daniel Masur | 6 | 6 |
| | | | | | 6 | Maxime Cressy | 4 | 4 |
| 5 | Tomáš Macháč | 3 | 6 | 6$^5$ | 6 | Maxime Cressy | 4 | 4 |
| 6 | Maxime Cressy | 6 | 3 | 7$^7$ | | | | |

### 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 |
| 1 | J Thompson | 7 | 6$^2$ | 7$^7$ | | | | | | | | | | | | |
| WC | M Rosenkranz | 5 | 7$^7$ | 6$^5$ | 1 | J Thompson | 6 | 3 | | | | | | | | |
| | R Bemelmans | 6$^6$ | 6 | 7 | | R Bemelmans | 1 | 1$^r$ | | | | | | | | |
| Q | Tobias Simon | 7$^8$ | 3 | 5 | | | | | | 1 | J Thompson | 3 | 1 | | | |
| | M-A Hüsler | 6 | 6 | | | | | | | | M-A Hüsler | 6 | 6 | | | |
| Q | Christopher Heyman | 1 | 1 | | | M-A Hüsler | 3 | 6 | 6 | | | | | | | |
| WC | MH Rehberg | 3 | 4 | | LL | L Miedler | 6 | 2 | 1 | | | | | | | |
| LL | L Miedler | 6 | 6 | | | | | | | | | | | M-A Hüsler | 2 | 3 |
| 4 | O Otte | 2 | 7$^7$ | 4 | | | | | | | | | | D Masur | 6 | 6 |
| | D Masur | 6 | 6$^3$ | 6 | | D Masur | 6 | 6 | | | | | | | | |
| WC | M Möller | 2 | 5 | | | M Bašić | 3 | 4 | | | | | | | | |
| | M Bašić | 6 | 7 | | | | | | | | D Masur | 6 | 6 | | | |
| | R Ramanathan | 7$^9$ | 4 | 6 | | | | | | | R Ramanathan | 3 | 3 | | | |
| LL | A Šetkić | 6$^7$ | 6 | 3 | | R Ramanathan | 7 | 7$^7$ | | | | | | | | |
| | M Marterer | 6 | 6 | | | M Marterer | 5 | 6$^4$ | | | | | | | | |
| 8 | K Żuk | 3 | 4 | | | | | | | | | | | | | |

### Bottom 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 | Semifinals |
| 5 | T Macháč | 7$^7$ | 4 | 6 | | | | | | | | | | | | | |
| | J Draper | 6$^5$ | 6 | 4 | 5 | T Macháč | 6 | 7$^7$ | | | | | | | | | |
| Q | H Squire | 7$^7$ | 2 | 7$^7$ | Q | H Squire | 2 | 6$^4$ | | | | | | | | | |
| LL | A Erler | 6$^3$ | 6 | 6$^5$ | | | | | 5 | T Macháč | 6 | 6 | | | | | |
| | M Copil | 2 | 6 | 6 | | | | | | D Stricker | 4 | 4 | | | | | |
| | V Sachko | 6 | 2 | 4 | | M Copil | 6$^3$ | 2 | | | | | | | | | |
| | D Stricker | 5 | 7$^7$ | 6 | | D Stricker | 7$^7$ | 6 | | | | | | | | | |
| 3 | J Rodionov | 7 | 6$^5$ | 4 | | | | | | | | | 5 | T Macháč | 3 | 6 | 6$^5$ |
| 6 | M Cressy | 6$^1$ | 6 | 6 | | | | | | | | | 6 | M Cressy | 6 | 3 | 7$^7$ |
| Q | J Härteis | 7$^7$ | 4 | 3 | 6 | M Cressy | 6 | 6 | | | | | | | | | |
| | G Blancaneaux | 6 | 6 | | | G Blancaneaux | 3 | 4 | | | | | | | | | |
| | E Furness | 1 | 1 | | | | | | 6 | M Cressy | 7$^7$ | 7$^7$ | | | | | |
| | A Vavassori | 6 | 3 | 6 | | | | | 2 | J Veselý | 6$^0$ | 6$^3$ | | | | | |
| | M Bachinger | 4 | 6 | 3 | | A Vavassori | 4 | 1 | | | | | | | | | |
| | J Forejtek | 1 | 7 | 5 | 2 | J Veselý | 6 | 6 | | | | | | | | | |
| 2 | J Veselý | 6 | 5 | 7 | | | | | | | | | | | | | |