2017 Brest Challenger – Singles

Norbert Gombos was the defending champion but lost in the first round to Corentin Moutet.

Moutet won the title after defeating Stefanos Tsitsipas 6–2, 7–6(10–8) in the final.

Seeds
• # 🇷🇺 Daniil Medvedev (quarterfinals)

• # 🇷🇴 Marius Copil (semifinals)

• # 🇸🇰 Norbert Gombos (first round)

• # 🇫🇷 Jérémy Chardy (quarterfinals)

• # 🇹🇳 Malek Jaziri (first round)

• # 🇷🇸 Laslo Đere (second round)

• # 🇷🇺 Andrey Kuznetsov (first round)

• # 🇮🇹 Matteo Berrettini (second round)