2020 ASB Classic – Men's singles

Tennys Sandgren was the defending champion, but lost to John Isner in the second round.

Ugo Humbert won his first title on the ATP Tour, defeating Benoît Paire in the final, 7–6(7–2), 3–6, 7–6(7–5).

Seeds
• #🇮🇹 Fabio Fognini (second round)

• #🇨🇦 Denis Shapovalov (quarterfinals)

• #🇷🇺 Karen Khachanov (second round)

• #🇺🇸 John Isner (semifinals)

• #🇫🇷 Benoît Paire (final)

• #🇵🇱 Hubert Hurkacz (semifinals)

• #🇫🇷 Adrian Mannarino (first round)

• #🇲🇩 Radu Albot (withdrew)

Seeds
• # 🇧🇴 Hugo Dellien (first round)

• # 🇮🇹 Marco Cecchinato (moved to main draw)

• # 🇸🇪 Mikael Ymer (qualified)

• # 🇧🇷 Thiago Monteiro (qualified)

• # 🇦🇷 Leonardo Mayer (qualifying competition, lucky loser)

• # 🇺🇸 Mackenzie McDonald (qualifying competition)

• # 🇯🇵 Tatsuma Ito (qualifying competition)

• # 🇨🇦 Vasek Pospisil (qualified)

Qualifiers
• # 🇺🇸 Michael Mmoh

• # 🇨🇦 Vasek Pospisil

• # 🇸🇪 Mikael Ymer

• # 🇧🇷 Thiago Monteiro

Lucky loser
• # 🇦🇷 Leonardo Mayer