2019 Sydney International – Men's singles

Daniil Medvedev was the defending champion, but withdrew before his first match.

Alex de Minaur won his first ATP Tour title, defeating Andreas Seppi in the final, 7–5, 7–6(7–5).

Seeds
The top four seeds receive a bye into the second round. • # Stefanos Tsitsipas (quarterfinals)

• #🇷🇺 Daniil Medvedev (withdrew due to right shoulder injury)

• #🇦🇷 Diego Schwartzman (semifinals)

• #🇫🇷 Gilles Simon (semifinals)

• #🇦🇺 Alex de Minaur (champion)

• #🇫🇷 Lucas Pouille (first round)

• #🇭🇺 Márton Fucsovics (second round)

• #🇮🇹 Andreas Seppi (final)

Seeds
• # Aljaž Bedene (first round)

• # 🇷🇺 Andrey Rublev (qualified)

• # 🇯🇵 Yoshihito Nishioka (qualified)

• # 🇯🇵 Taro Daniel (qualifying competition, lucky loser)

• # 🇦🇷 Guido Andreozzi (qualifying competition, lucky loser)

• # 🇪🇸 Jaume Munar (first round)

• # 🇪🇸 Pablo Andújar (first round)

• # Cristian Garín (qualifying competition)

Qualifiers
• # 🇪🇸 Guillermo García López

• # 🇷🇺 Andrey Rublev

• # 🇯🇵 Yoshihito Nishioka

• # 🇺🇸 Reilly Opelka

Lucky losers
• # 🇦🇷 Guido Andreozzi

• # 🇯🇵 Taro Daniel