2018 Kunal Patel San Francisco Open – Singles

Zhang Ze was the defending champion but chose not to defend his title.

Jason Jung won the title after defeating Dominik Köpfer 6–4, 2–6, 7–6(7–5) in the final.

Seeds
• # 🇰🇿 Alexander Bublik (first round)

• # 🇺🇸 Mackenzie McDonald (second round)

• # 🇺🇸 Michael Mmoh (quarterfinals)

• # 🇺🇸 Denis Kudla (second round)

• # 🇺🇸 Bradley Klahn (quarterfinals)

• # 🇺🇸 Noah Rubin (quarterfinals)

• # 🇨🇦 Filip Peliwo (quarterfinals)

• # 🇨🇦 Brayden Schnur (first round)