2019 Halle Open – Singles

Borna Ćorić was the defending champion, but retired from his quarterfinal match against Pierre-Hugues Herbert.

Roger Federer won the title, defeating David Goffin in the final, 7–6(7–2), 6–1. It was Federer's record-extending tenth (and final) singles title singles title in Halle, sixteen years after his first win in 2003.

Seeds
• # Roger Federer (champion)

• #🇩🇪 Alexander Zverev (quarterfinals)

• #🇷🇺 Karen Khachanov (quarterfinals)

• # Borna Ćorić (quarterfinals, retired)

• #🇫🇷 Gaël Monfils (first round)

• # Nikoloz Basilashvili (first round)

• #🇪🇸 Roberto Bautista Agut (quarterfinals)

• #🇦🇷 Guido Pella (first round)

Seeds
• # João Sousa (qualified)

• # 🇮🇹 Andreas Seppi (qualified)

• # 🇮🇹 Lorenzo Sonego (first round)

• # 🇷🇺 Andrey Rublev (first round)

• # 🇷🇸 Miomir Kecmanović (qualifying competition, lucky loser)

• # 🇺🇸 Denis Kudla (qualifying competition)

• # Lloyd Harris (first round)

• # Ernests Gulbis (first round)

Qualifiers
• # João Sousa

• # 🇮🇹 Andreas Seppi

• # 🇺🇦 Sergiy Stakhovsky

• # 🇩🇪 Mats Moraing

Lucky loser

 * 1) 🇷🇸 Miomir Kecmanović