The 2021 IBG Prague Open was a professional tennis tournament played on clay courts. It was part of the 2021 ATP Challenger Tour. It took place in Prague, Czech Republic between 23 and 29 August 2021.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 RUS
|
Evgeny Karlovskiy | 290 | 1 |
 USA
|
Alexander Ritschard | 300 | 2 |
| RUS
|
Evgenii Tiurnev | 310 | 3 |
 FRA
|
Geoffrey Blancaneaux | 311 | 4 |
 CZE
|
Jonáš Forejtek | 315 | 5 |
 BEL
|
Michael Geerts | 319 | 6 |
 ROU
|
Filip Jianu | 320 | 7 |
 SRB
|
Miljan Zekić | 324 | 8 |
- 1 Rankings as of 16 August 2021.[1]
Other entrants
The following players received wildcards into the singles main draw:
- Martin Krumich
- Andrew Paulson
- Daniel Siniakov
The following player received entry into the singles main draw using a protected ranking:
The following players received entry from the qualifying draw:
Champions
Singles
Franco Agamenone def. 
Ryan Peniston 6–3, 6–1.
Doubles
- Victor Vlad Cornea /
Petros Tsitsipas def. Martin Krumich / Andrew Paulson 6–3, 3–6, [10–8].
References
- ^ "Rankings | Singles | ATP Tour | Tennis". ATP Tour.