| Singles | |
|---|---|
| 2017 Open BNP Paribas Banque de Bretagne | |
| Champion |  Adrian Mannarino |
| Runner-up |  Peter Gojowczyk |
| Final score | 6–4, 6–4 |
Andrey Rublev was the defending champion but lost in the semifinals to Peter Gojowczyk.
Adrian Mannarino won the title after defeating Gojowczyk 6–4, 6–4 in the final.
Adrian Mannarino (champion) Jérémy Chardy (withdrew)
Sergiy Stakhovsky (quarterfinals)
Evgeny Donskoy (first round) Julien Benneteau (second round) Vincent Millot (first round) Andrey Rublev (semifinals) Peter Gojowczyk (final)| Semifinals | Final | ||||||||||||
| 1 | Adrian Mannarino | 7 | 6 | ||||||||||
| Quentin Halys | 5 | 4 | |||||||||||
| 1 | Adrian Mannarino | 6 | 6 | ||||||||||
| 8 | Peter Gojowczyk | 4 | 4 | ||||||||||
| 8 | Peter Gojowczyk | 77 | 4 | 6 | |||||||||
| 7 | Andrey Rublev | 65 | 6 | 3 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Mannarino | 6 | 7 | ||||||||||||||||||||||||
| WC | E Furness | 3 | 5 | 1 | A Mannarino | 6 | 3 | 6 | |||||||||||||||||||
 Yannik Reuter | 2 | 3 | WC |  J Janowicz | 4 | 6 | 4 | ||||||||||||||||||||
| WC | J Janowicz | 6 | 6 | 1 | A Mannarino | 6 | 6 | ||||||||||||||||||||
| Q | G Sakharov | 6 | 6 | Q | G Sakharov | 4 | 4 | ||||||||||||||||||||
 U Ignatik | 3 | 3 | Q | G Sakharov | 3 | 6 | 77 | ||||||||||||||||||||
| WC | G Blancaneaux | 2 | 4 | 5 | J Benneteau | 6 | 4 | 64 | |||||||||||||||||||
| 5 | J Benneteau | 6 | 6 | 1 | A Mannarino | 7 | 6 | ||||||||||||||||||||
| 4 | E Donskoy | 5 | 3 | Q Halys | 5 | 4 | |||||||||||||||||||||
| T Gabashvili | 7 | 6 | T Gabashvili | 3 | 4 | ||||||||||||||||||||||
| Q Halys | 78 | 6 | Q Halys | 6 | 6 | ||||||||||||||||||||||
 M Zekić | 66 | 1 | Q Halys | 77 | 77 | ||||||||||||||||||||||
| PR |  J Melzer | 3 | 4 | Q | A Karatsev | 65 | 64 | ||||||||||||||||||||
 S Napolitano | 6 | 6 | S Napolitano | 3 | 5 | ||||||||||||||||||||||
| Q | A Karatsev | 6 | 6 | Q | A Karatsev | 6 | 7 | ||||||||||||||||||||
| 6 | V Millot | 3 | 4 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | P Gojowczyk | 6 | 6 | ||||||||||||||||||||||||
| WC | M Hamou | 2 | 4 | 8 | P Gojowczyk | 6 | 62 | 6 | |||||||||||||||||||
 S Diez | 6 | 6 | S Diez | 2 | 77 | 4 | |||||||||||||||||||||
 J Samper-Montaña | 4 | 2 | 8 | P Gojowczyk | 7 | 77 | |||||||||||||||||||||
| E López-Pérez | 6 | 79 | 3 | S Stakhovsky | 5 | 64 | |||||||||||||||||||||
| M Tepavac | 4 | 67 | E López-Pérez | 6 | 5 | 3 | |||||||||||||||||||||
| Q | C Hemery | 64 | 6 | 2 | 3 | S Stakhovsky | 4 | 7 | 6 | ||||||||||||||||||
| 3 | S Stakhovsky | 77 | 4 | 6 | 8 | P Gojowczyk | 77 | 4 | 6 | ||||||||||||||||||
| 7 | A Rublev | 6 | 3 | 79 | 7 | A Rublev | 65 | 6 | 3 | ||||||||||||||||||
 S Tsitsipas | 2 | 6 | 67 | 7 | A Rublev | 6 | 63 | 6 | |||||||||||||||||||
 H Moriya | 5 | 2 | Q | H Nys | 4 | 77 | 3 | ||||||||||||||||||||
| Q | H Nys | 7 | 6 | 7 | A Rublev | 6 | 6 | ||||||||||||||||||||
| T Lamasine | 4 | 6 | 6 | T Lamasine | 4 | 4 | |||||||||||||||||||||
| L Đere | 6 | 4 | 2 | T Lamasine | 6 | 6 | |||||||||||||||||||||
| M Bourgue | 77 | 6 | M Bourgue | 2 | 1 | ||||||||||||||||||||||
| LL | G Jacq | 63 | 2 | ||||||||||||||||||||||||
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Novak Djokovic was the defending champion, but lost to Roger Federer in the semifinals 6–3, 3–6, 2–6.
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Roger Federer was the defending champion, but chose not to participate this year.
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Two-time defending champion Rafael Nadal successfully defended his title, defeating Stefanos Tsitsipas in the final, 6–2, 6–1. By winning the title, Nadal retained the ATP no. 1 singles ranking. It was Nadal's record-extending eleventh Barcelona Open title and his 20th ATP 500 title overall, equaling Roger Federer's record. It was Tsitsipas' maiden ATP final.
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Peter Gojowczyk was the defending champion, but lost to Kei Nishikori in the second round.
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Alexander Zverev was the two-time defending champion, but lost to Cristian Garín in the quarterfinals.
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Roberto Bautista Agut was the defending champion, but chose to compete in the ATP Cup instead.
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Andrey Rublev was the reigning champion from when the tournament was last held in 2019, but lost to Adrian Mannarino in the second round in a rematch of the 2019 final.
Andrey Rublev was the defending champion, but chose to compete in St. Petersburg instead.