2019 ABN AMRO World Tennis Tournament – Singles

Roger Federer was the defending champion, but chose not to participate this year.

Gaël Monfils won the title, defeating Stan Wawrinka in the final, 6–3, 1–6, 6–2. This was Wawrinka's first final in any ATP Tour event since the 2017 French Open.

Seeds
• #🇯🇵 Kei Nishikori (semifinals)

• #🇷🇺 Karen Khachanov (first round)

• # Stefanos Tsitsipas (first round)

• #🇨🇦 Milos Raonic (second round)

• #🇷🇺 Daniil Medvedev (semifinals)

• #🇫🇷 Lucas Pouille (withdrew)

• #🇪🇸 Roberto Bautista Agut (withdrew)

• #🇧🇪 David Goffin (first round)

• # Nikoloz Basilashvili (second round)

• #🇨🇦 Denis Shapovalov (quarterfinals)

Seeds
• # 🇫🇷 Gilles Simon (qualified)

• # 🇩🇪 Jan-Lennard Struff (first round)

• # 🇷🇴 Marius Copil (qualifying competition, lucky loser)

• # 🇩🇪 Peter Gojowczyk (qualified)

• # 🇺🇸 Denis Kudla (first round)

• # 🇧🇾 Ilya Ivashka (first round)

• # Ernests Gulbis (qualifying competition, lucky loser)

• # 🇮🇹 Thomas Fabbiano (qualified)

Qualifiers
• # 🇫🇷 Gilles Simon

• # Franko Škugor

• # 🇮🇹 Thomas Fabbiano

• # 🇩🇪 Peter Gojowczyk

Lucky losers
• # 🇷🇴 Marius Copil

• # Ernests Gulbis