2021 Sofia Open
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| 2021 Sofia Open | |
|---|---|
| Date | 27 September – 3 October |
| Edition | 6th |
| Category | ATP World Tour 250 series |
| Draw | 28S / 16D |
| Prize money | €419,470 |
| Surface | Hard (indoor) |
| Location | Sofia, Bulgaria |
| Venue | Arena Armeec |
| Champions | |
| Singles | |
 Jannik Sinner[1] | |
| Doubles | |
 Jonny O'Mara / Ken Skupski[2] | |
The 2021 Sofia Open was a men's tennis tournament played on indoor hard courts. It was the sixth edition of the Sofia Open as part of the ATP World Tour 250 series of the 2021 ATP Tour. It was played at the Arena Armeec in Sofia, Bulgaria, from 27 September to 3 October 2021. First-seeded Jannik Sinner won the singles title.[3]
Singles
Jannik Sinner defeated 
Gaël Monfils 6–3, 6–4
Doubles
Jonny O'Mara / Ken Skupski defeated 
Oliver Marach / Philipp Oswald, 6–3, 6–4
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| ITA |
Jannik Sinner | 14 | 1 |
 FRA |
Gaël Monfils | 20 | 2 |
 AUS |
Alex de Minaur | 21 | 3 |
 KAZ |
|||
 SRB |
Filip Krajinović | 37 | 5 |
| FRA |
Adrian Mannarino | 43 | 6 |
 ESP |
Alejandro Davidovich Fokina | 45 | 7 |
| AUS |
John Millman | 48 | 8 |
Other entrants
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Withdrawals
- Before the tournament
Roberto Bautista Agut → replaced by 
James Duckworth
Alexander Bublik → replaced by 
Kamil Majchrzak
Marin Čilić → replaced by Gianluca Mager
Mackenzie McDonald → replaced by 
Emil Ruusuvuori
- During the tournament
