2019 ASB Classic – Men's singles

Roberto Bautista Agut was the defending champion, but withdrew before the tournament began.

Tennys Sandgren won his first title on the ATP Tour, defeating Cameron Norrie in the final, 6–4, 6–2.

Seeds
The top four seeds received a bye into the second round. • # 🇺🇸 John Isner (second round)

• # 🇮🇹 Fabio Fognini (quarterfinals)

• # 🇮🇹 Marco Cecchinato (second round)

• # 🇪🇸 Pablo Carreño Busta (quarterfinals)

• # 🇪🇸 Roberto Bautista Agut (withdrew)

• # 🇰🇷 Chung Hyeon (first round)

• # 🇨🇦 Denis Shapovalov (first round)

• # 🇫🇷 Gaël Monfils (withdrew)

• # 🇺🇸 Steve Johnson (first round)

Seeds
• #🇪🇸 Albert Ramos Viñolas (withdrew, accepted into main draw in Sydney)

• #🇩🇪 Maximilian Marterer (qualified)

• #🇺🇸 Bradley Klahn (qualified)

• #🇺🇸 Mackenzie McDonald (qualified)

• # Pablo Cuevas (qualifying competition, lucky loser)

• #🇬🇧 Cameron Norrie (Received wildcard into main draw)

• #🇷🇸 Laslo Đere (qualifying competition, lucky loser)

• #🇮🇹 Thomas Fabbiano (qualifying competition)

Qualifiers
• # 🇫🇷 Ugo Humbert

• # 🇩🇪 Maximilian Marterer

• # 🇺🇸 Bradley Klahn

• # 🇺🇸 Mackenzie McDonald

Lucky loser
• # 🇷🇸 Laslo Đere

• # Pablo Cuevas