# 2021 Tali Open – Singles

Emil Ruusuvuori was the defending champion but withdrew from the tournament before his first round match.
Alex Molčan won the title after defeating João Sousa 6–3, 6–2 in the final.

## Seeds

* Emil Ruusuvuori (withdrew)
* Henri Laaksonen (semifinals)
* Alex Molčan (champion)
* Egor Gerasimov (first round)
* Oscar Otte (quarterfinals)
* Liam Broady (quarterfinals)
* Jozef Kovalík (first round)
* Nikola Milojević (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 | Alexander Shevchenko | 2 | 6$^4$ | | | | |
| 3 | Alex Molčan | 6 | 7$^7$ | | | | |
| 3 | Alex Molčan | 6 | 7$^7$ | 3 | Alex Molčan | 6 | 6 |
| | | | | | João Sousa | 3 | 2 |
| | João Sousa | 6 | 6 | | João Sousa | 3 | 2 |
| 2 | Henri Laaksonen | 4 | 3 | | | | |

### 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 |
| LL | K Jacquet | 2 | 1 | | | | | | | | | | | | | | | |
| Q | A Shevchenko | 6 | 6 | | Q | A Shevchenko | 7$^8$ | 5 | | | | | | | | | | |
| | K Coppejans | 4 | 4 | | Alt | M Bachinger | 6$^6$ | 1$^r$ | | | | | | | | | | |
| Alt | M Bachinger | 6 | 6 | | | | | | | Q | A Shevchenko | 6 | 0 | | | | | |
| | E Gómez | 6 | 2 | 3 | | | | | | | M Moraing | 4 | 0$^r$ | | | | | |
| | M Marterer | 4 | 6 | 6 | | M Marterer | 6$^5$ | 6 | 4 | | | | | | | | | |
| | M Moraing | 6 | 6 | | | M Moraing | 7$^7$ | 2 | 6 | | | | | | | | | |
| 7 | J Kovalík | 3 | 4 | | | | | | | | | | | | Q | A Shevchenko | 2 | 6$^4$ |
| 3 | A Molčan | 6 | 0 | 7$^7$ | | | | | | | | | | | 3 | A Molčan | 6 | 7$^7$ |
| | T van Rijthoven | 4 | 6 | 6$^1$ | 3 | A Molčan | 6 | 6 | | | | | | | | | | |
| | F Ferreira Silva | 3 | 6 | 3$^r$ | Q | S Mochizuki | 3 | 2 | | | | | | | | | | |
| Q | S Mochizuki | 6 | 2 | 4 | | | | | | 3 | A Molčan | 6 | 4 | 6 | | | | |
| | J Rodionov | 7 | 6 | | | | | | | 5 | O Otte | 3 | 6 | 1 | | | | |
| | M Safwat | 5 | 4 | | | J Rodionov | 1 | 2 | | | | | | | | | | |
| | D Džumhur | 2 | 3 | | 5 | O Otte | 6 | 6 | | | | | | | | | | |
| 5 | O Otte | 6 | 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 |
| 6 | L Broady | 6 | 6 | | | | | | | | | | | | | | | |
| SE | Z Piros | 3 | 2 | | 6 | L Broady | 6 | 7 | | | | | | | | | | |
| Q | J De Loore | 6 | 6 | | Q | J De Loore | 3 | 5 | | | | | | | | | | |
| | T Kamke | 3 | 4 | | | | | | | 6 | L Broady | 7$^7$ | 2 | 6$^1$ | | | | |
| | J Sousa | 6 | 7$^{11}$ | | | | | | | | J Sousa | 6$^3$ | 6 | 7$^7$ | | | | |
| WC | P Niklas-Salminen | 3 | 6$^9$ | | | J Sousa | 5 | 6 | 6 | | | | | | | | | |
| Q | J Forejtek | 4 | 6 | 6 | Q | J Forejtek | 7 | 4 | 4 | | | | | | | | | |
| 4 | E Gerasimov | 6 | 3 | 4 | | | | | | | | | | | | J Sousa | 6 | 6 |
| 8 | N Milojević | 6 | 6 | | | | | | | | | | | | 2 | H Laaksonen | 4 | 3 |
| | F Cobolli | 3 | 2 | | 8 | N Milojević | 3 | 6 | 6 | | | | | | | | | |
| | R Ramanathan | 4 | 6 | 6 | | R Ramanathan | 6 | 1 | 2 | | | | | | | | | |
| WC | O Virtanen | 6 | 4 | 3 | | | | | | 8 | N Milojević | 2 | 3 | | | | | |
| WC | J Draper | 5 | 1 | | | | | | | 2 | H Laaksonen | 6 | 6 | | | | | |
| Alt | J Lenz | 7 | 6 | | Alt | J Lenz | 2 | 5 | | | | | | | | | | |
| | D Istomin | 3 | 3 | | 2 | H Laaksonen | 6 | 7 | | | | | | | | | | |
| 2 | H Laaksonen | 6 | 6 | | | | | | | | | | | | | | | |