| Singles | |
|---|---|
| 2021 Ostrava Challenger | |
| Champion |  Benjamin Bonzi |
| Runner-up |  Renzo Olivo |
| Score | 6–4, 6–4 |
Aslan Karatsev was the defending champion [1] but chose not to defend his title.
Benjamin Bonzi won the title after defeating Renzo Olivo 6–4, 6–4 in the final.
Grégoire Barrère (second round)
Thiago Seyboth Wild (first round) Benjamin Bonzi (champion) Arthur Rinderknech (semifinals, retired)
Marc Polmans (quarterfinals)
Maxime Cressy (first round)
Alejandro Tabilo (second round)
Mohamed Safwat (first round)| Semifinals | Final | ||||||||||||
| Renzo Olivo | 5 | ||||||||||||
| 4 | Arthur Rinderknech | 4r | |||||||||||
| Renzo Olivo | 4 | 4 | |||||||||||
| 3 | Benjamin Bonzi | 6 | 6 | ||||||||||
| 3 | Benjamin Bonzi | 6 | 4 | 77 | |||||||||
 Elias Ymer | 3 | 6 | 65 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | G Barrère | 711 | 7 | ||||||||||||||||||||||||
| Q |  O Otte | 69 | 5 | 1 | G Barrère | 6 | 4 | 3 | |||||||||||||||||||
 Z Kolář | 6 | 4 | 2 | TM Etcheverry | 3 | 6 | 6 | ||||||||||||||||||||
| TM Etcheverry | 1 | 6 | 6 | TM Etcheverry | 4 | 4 | |||||||||||||||||||||
| Q |  L Miedler | 3 | 6 | 4 | R Olivo | 6 | 6 | ||||||||||||||||||||
| R Olivo | 6 | 3 | 6 | R Olivo | 6 | 6 | |||||||||||||||||||||
 R Haase | 2 | 6 | 4 | 7 | A Tabilo | 2 | 3 | ||||||||||||||||||||
| 7 | A Tabilo | 6 | 4 | 6 | R Olivo | 5 | |||||||||||||||||||||
| 4 | A Rinderknech | 6 | 6 | 4 | A Rinderknech | 4r | |||||||||||||||||||||
| M Bourgue | 4 | 0 | 4 | A Rinderknech | 7 | 6 | |||||||||||||||||||||
 B Schnur | 6 | 1 | 6 | B Schnur | 5 | 4 | |||||||||||||||||||||
| Alt | MT Barrios Vera | 2 | 6 | 1 | 4 | A Rinderknech | 3 | 6 | 6 | ||||||||||||||||||
| P Polansky | 3 | 5 | Q |  L Klein | 6 | 3 | 4 | ||||||||||||||||||||
| Q | L Klein | 6 | 7 | Q | L Klein | 77 | 4 | 6 | |||||||||||||||||||
| L Rosol | 64 | 6 | 7 | L Rosol | 62 | 6 | 2 | ||||||||||||||||||||
| 8 | M Safwat | 77 | 2 | 5 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | M Polmans | 6 | 6 | ||||||||||||||||||||||||
 B Kavčič | 3 | 3 | 5 | M Polmans | 6 | 6 | |||||||||||||||||||||
 D Istomin | 0 | 6 | 6 | D Istomin | 3 | 0 | |||||||||||||||||||||
| L Lacko | 6 | 1 | 4 | 5 | M Polmans | 4 | 2 | ||||||||||||||||||||
| C Lestienne | 2 | 0 | 3 | B Bonzi | 6 | 6 | |||||||||||||||||||||
| WC | J Lehečka | 6 | 6 | WC | J Lehečka | 3 | 4 | ||||||||||||||||||||
 R Safiullin | 2 | 1 | 3 | B Bonzi | 6 | 6 | |||||||||||||||||||||
| 3 | B Bonzi | 6 | 6 | 3 | B Bonzi | 6 | 4 | 77 | |||||||||||||||||||
| 6 | M Cressy | 6 | 65 | 4 | E Ymer | 3 | 6 | 65 | |||||||||||||||||||
| E Ymer | 3 | 77 | 6 | E Ymer | 6 | 6 | |||||||||||||||||||||
| WC | P Rikl | 4 | 2 |  S Stakhovsky | 1 | 2 | |||||||||||||||||||||
| S Stakhovsky | 6 | 6 | E Ymer | 7 | 6 | ||||||||||||||||||||||
| S Báez | 6 | 6 | Q | A Molčan | 5 | 3 | |||||||||||||||||||||
| WC | Martin Krumich | 2 | 2 | S Báez | 6 | 1 | 2r | ||||||||||||||||||||
| Q | A Molčan | 6 | 6 | Q | A Molčan | 4 | 6 | 4 | |||||||||||||||||||
| 2 | T Seyboth Wild | 1 | 4 | ||||||||||||||||||||||||
Benjamin Bonzi and Quentin Halys were the defending champions, but were not eligible to compete this year.
Denis Shapovalov was the defending champion but chose not to defend his title.
Ken and Neal Skupski were the defending champions, but lost in the quarterfinals to Benjamin Bonzi and Antoine Hoang.
Ilya Ivashka was the defending champion but chose not to defend his title.
This was the second edition of the tournament. There was no defending champion as the tournament was canceled at the quarterfinals stage due to the COVID-19 pandemic.
Roberto Bautista Agut was the defending champion but chose not to defend his title.
Nicola Kuhn was the defending champion but chose not to defend his title.
Daniil Medvedev defeated Reilly Opelka in the final, 6–4, 6–3 to win the men's singles tennis title at the 2021 Canadian Open. It was his fourth ATP Masters 1000 title and 12th career title. Opelka was contesting his maiden Masters 1000 final.
Jo-Wilfried Tsonga was the defending champion but chose not to defend his title.
Arthur Rinderknech was the defending champion but lost in the semifinals to Benjamin Bonzi.
Andrey Rublev was the defending champion, but lost in the quarterfinals to Botic van de Zandschulp.
Novak Djokovic defeated the defending champion Daniil Medvedev in the final, 4–6, 6–3, 6–3 to win the singles tennis title at the 2021 Paris Masters. It was his record-extending sixth Paris Masters title and record-breaking 37th ATP Tour Masters 1000 title overall, surpassing Rafael Nadal's tally in the latter category.
Ruben Bemelmans was the defending champion but lost in the quarterfinals to Zizou Bergs.
Andrey Rublev defeated Félix Auger-Aliassime in the final, 7–5, 7–6(7–4) to win the singles title at the 2022 Open 13 Provence.
Benjamin Bonzi was the defending champion but chose not to defend his title.
Carlos Taberner was the defending champion but chose not to defend his title.
Benjamin Bonzi was the defending champion but chose not to defend his title.
Benjamin Bonzi was the defending champion but chose not to defend his title.
Tallon Griekspoor defeated Benjamin Bonzi in the final, 4–6, 7–5, 6–3 to win the singles tennis title at the 2023 Maharashtra Open. It was his maiden ATP Tour singles title.
Alexander Bublik defeated Andrey Rublev in the final, 6–3, 3–6, 6–3 to win the singles tennis title at the 2023 Halle Open.