2018 Oracle Challenger Series – Newport Beach – Men's singles

This was the first edition of the tournament.

Taylor Fritz won the title after defeating Bradley Klahn 3–6, 7–5, 6–0 in the final.

Seeds
• # 🇯🇵 Kei Nishikori (first round)

• # 🇺🇸 Frances Tiafoe (first round)

• # 🇺🇸 Taylor Fritz (champion)

• # 🇺🇸 Bjorn Fratangelo (second round, retired)

• # 🇬🇧 Cameron Norrie (first round)

• # 🇰🇿 Alexander Bublik (second round)

• # 🇺🇸 Ernesto Escobedo (first round)

• # 🇩🇪 Yannick Hanfmann (first round)