2021 Open Quimper Bretagne – Singles

Cem İlkel was the defending champion but chose to compete in Antalya instead.

Sebastian Korda won the title after defeating Filip Horanský 6–1, 6–1 in the final.

Seeds
• # 🇫🇷 Lucas Pouille (first round)

• # 🇺🇸 Sebastian Korda (champion)

• # 🇫🇷 Grégoire Barrère (second round)

• # 🇺🇸 Denis Kudla (first round)

• # 🇮🇹 Federico Gaio (second round)

• # 🇦🇹 Jurij Rodionov (first round)

• # 🇩🇪 Peter Gojowczyk (first round)

• # Marc-Andrea Hüsler (first round)