2021 Open de Rennes
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The 2021 Open Blot Rennes was a professional tennis tournament played on hard courts. It was the fifteenth edition of the tournament and part of the 2021 ATP Challenger Tour. It took place in Rennes, France between 13 and 19 September 2021.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| FRA | Richard Gasquet | 79 | 1 |
| FRA | Arthur Rinderknech | 83 | 2 |
| FRA | Benjamin Bonzi | 94 | 3 |
| FRA | Gilles Simon | 103 | 4 |
| GBR | Andy Murray | 112 | 5 |
| FRA | Lucas Pouille | 133 | 6 |
| FRA | Grégoire Barrère | 136 | 7 |
| CZE | Tomáš Macháč | 143 | 8 |
- 1 Rankings are as of 30 August 2021.
Other entrants
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Champions
Singles
- France Benjamin Bonzi def. Germany Mats Moraing 7–6(7–3), 7–6(7–3).
Doubles
- Netherlands Bart Stevens / Netherlands Tim van Rijthoven def. Czech Republic Marek Gengel / Czech Republic Tomáš Macháč 6–7(2–7), 7–5, [10–3].