| Singles | |
|---|---|
| 2021 Open de Rennes | |
| Champion |  Benjamin Bonzi |
| Runner-up |  Mats Moraing |
| Score | 7–6(7–3), 7–6(7–3) |
Arthur Rinderknech was the defending champion [1] but lost in the semifinals to Benjamin Bonzi.
Bonzi won the title after defeating Mats Moraing 7–6(7–3), 7–6(7–3) in the final.
Richard Gasquet (semifinals) Arthur Rinderknech (semifinals) Benjamin Bonzi (champion) Gilles Simon (first round)
Andy Murray (second round) Lucas Pouille (quarterfinals) Grégoire Barrère (second round)
Tomáš Macháč (second round)| Semifinals | Final | ||||||||||||
| 1 | Richard Gasquet | 4 | 7 | 2 | |||||||||
| Mats Moraing | 6 | 5 | 6 | ||||||||||
| Mats Moraing | 63 | 63 | |||||||||||
| 3 | Benjamin Bonzi | 77 | 77 | ||||||||||
| 3 | Benjamin Bonzi | 69 | 77 | 6 | |||||||||
| 2 | Arthur Rinderknech | 711 | 64 | 1 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | R Gasquet | 77 | 6 | ||||||||||||||||||||||||
| WC | K Jacquet | 64 | 3 | 1 | R Gasquet | 6 | 6 | ||||||||||||||||||||
 B Schnur | 4 | 4 | Q | C Chidekh | 1 | 4 | |||||||||||||||||||||
| Q | C Chidekh | 6 | 6 | 1 | R Gasquet | 78 | 7 | ||||||||||||||||||||
| Q | M Guinard | 4 | 3 |  R Safiullin | 66 | 5 | |||||||||||||||||||||
| R Safiullin | 6 | 6 | R Safiullin | 6 | 4 | 6 | |||||||||||||||||||||
| Y Maden | 3 | 1 | 5/WC | A Murray | 2 | 6 | 1 | ||||||||||||||||||||
| 5/WC | A Murray | 6 | 6 | 1 | R Gasquet | 4 | 7 | 2 | |||||||||||||||||||
| 4 | G Simon | 3 | 2 | M Moraing | 6 | 5 | 6 | ||||||||||||||||||||
| Alt | T Gabashvili | 6 | 6 | Alt | T Gabashvili | 4 | 6 | 6 | |||||||||||||||||||
 E Escobedo | 7 | 6 | E Escobedo | 6 | 2 | 3 | |||||||||||||||||||||
| C Lestienne | 5 | 1 | Alt | T Gabashvili | 2 | 63 | |||||||||||||||||||||
| M Moraing | 4 | 7 | 6 | M Moraing | 6 | 77 | |||||||||||||||||||||
| WC | H Mayot | 6 | 5 | 2 | M Moraing | 711 | 6 | ||||||||||||||||||||
| Q | C Hemery | 1 | 1 | 8 | T Macháč | 69 | 1 | ||||||||||||||||||||
| 8 | T Macháč | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | G Barrère | 79 | 7 | ||||||||||||||||||||||||
 T van Rijthoven | 67 | 5 | 7 | G Barrère | 67 | 6 | 4 | ||||||||||||||||||||
| Q |  A Bega | 2 | 1 | L Broady | 79 | 4 | 6 | ||||||||||||||||||||
| L Broady | 6 | 6 | L Broady | 4 | 2 | ||||||||||||||||||||||
 K Żuk | 7 | 6 | 3 | B Bonzi | 6 | 6 | |||||||||||||||||||||
| LL | M Rosenkranz | 5 | 3 | K Żuk | 63 | 3 | |||||||||||||||||||||
 E Ymer | 3 | 4 | 3 | B Bonzi | 77 | 6 | |||||||||||||||||||||
| 3 | B Bonzi | 6 | 6 | 3 | B Bonzi | 69 | 77 | 6 | |||||||||||||||||||
| 6 | L Pouille | 5 | 6 | 6 | 2 | A Rinderknech | 711 | 64 | 1 | ||||||||||||||||||
| M Janvier | 7 | 4 | 3 | 6 | L Pouille | 3 | 6 | 6 | |||||||||||||||||||
| LL | D Added | 3 | 4 | A Hoang | 6 | 3 | 4 | ||||||||||||||||||||
| A Hoang | 6 | 6 | 6 | L Pouille | 3 | 63 | |||||||||||||||||||||
 G Soeda | 64 | 4 | 2 | A Rinderknech | 6 | 77 | |||||||||||||||||||||
| T Lamasine | 77 | 6 | T Lamasine | 68 | 2 | ||||||||||||||||||||||
| T Kamke | 3 | 6 | 3 | 2 | A Rinderknech | 710 | 6 | ||||||||||||||||||||
| 2 | A Rinderknech | 6 | 3 | 6 | |||||||||||||||||||||||
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