- Source: 2021 Cassis Open Provence
- Benjamin Bonzi
- 2021 Cassis Open Provence
- 2021 Cassis Open Provence – Singles
- 2021 Cassis Open Provence – Doubles
- Cassis Open Provence
- 2022 Cassis Open Provence
- 2022 Cassis Open Provence – Doubles
- 2022 Cassis Open Provence – Singles
- 2019 Cassis Open Provence
- 2019 Cassis Open Provence – Doubles
- 2019 Cassis Open Provence – Singles
The 2021 Cassis Open Provence was a professional tennis tournament played on hard courts. It was the 3rd edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Cassis, France between 6 and 12 September 2021.
Singles main-draw entrants
= Seeds
=1 Rankings are as of 30 August 2021.
= Other entrants
=The following players received wildcards into the singles main draw:
Clément Chidekh
Arthur Fils
Luca Van Assche
The following players received entry into the singles main draw as alternates:
Hugo Grenier
Tatsuma Ito
Bernard Tomic
Yosuke Watanuki
The following players received entry from the qualifying draw:
Nicolás Jarry
Hiroki Moriya
Giovanni Mpetshi Perricard
Ramkumar Ramanathan
The following players received entry as lucky losers:
Arthur Cazaux
Alexis Galarneau
Laurent Lokoli
Champions
= Singles
=Benjamin Bonzi def. Lucas Pouille 7–6(7–4), 6–4.
= Doubles
=Sriram Balaji / Ramkumar Ramanathan def. Hans Hach Verdugo / Miguel Ángel Reyes-Varela 6–4, 3–6, [10–6].