2019 Swiss Indoors – Singles

Roger Federer was the two-time defending champion and successfully defended his title, defeating Alex de Minaur in the final, 6–2, 6–2. He did not lose a single set in the entire tournament. The victory made Federer the first player in ATP history to win 10 same tournament titles on two different surfaces. It was his 103rd and final ATP title before announcing his retirement in 2022.

Seeds
• # Roger Federer (champion)

• #🇩🇪 Alexander Zverev (first round)

• # Stefanos Tsitsipas (semifinals)

• #🇪🇸 Roberto Bautista Agut (quarterfinals)

• #🇮🇹 Fabio Fognini (second round)

• #🇧🇪 David Goffin (second round)

• # Stan Wawrinka (quarterfinals, withdrew)

• #🇫🇷 Benoît Paire (first round)

Seeds
• # 🇳🇴 Casper Ruud (qualifying competition)

• # João Sousa (first round)

• # 🇱🇹 Ričardas Berankis (qualified)

• # 🇯🇵 Yoshihito Nishioka (qualifying competition)

• # 🇧🇴 Hugo Dellien (qualified)

• # 🇫🇷 Grégoire Barrère (qualifying competition, withdrew)

• # Ivo Karlović (first round)

• # 🇰🇷 Kwon Soon-woo (qualifying competition)

Qualifiers
• # 🇩🇪 Peter Gojowczyk

• # 🇦🇺 Alexei Popyrin

• # 🇱🇹 Ričardas Berankis

• # 🇧🇴 Hugo Dellien