2013 Apia International Sydney – Men's singles

Jarkko Nieminen was the defending champion, but lost to eventual champion Bernard Tomic in the quarterfinals. It was Tomic's first ATP title and his first final; he defeated Kevin Anderson 6–3, 6–7(2–7), 6–3 in the final.

Seeds
• # 🇺🇸 John Isner (second round)

• # 🇫🇷 Gilles Simon (withdrew due to a neck injury)

• # 🇮🇹 Andreas Seppi (semifinals)

• # 🇪🇸 Fernando Verdasco (second round)

• # 🇩🇪 Florian Mayer (second round)

• # 🇨🇿 Radek Štěpánek (second round, retired due to an intercostal muscle strain)

• # 🇫🇷 Jérémy Chardy (first round)

• # 🇪🇸 Marcel Granollers (quarterfinals)

Seeds
• # 🇫🇷 Michaël Llodra (withdrew due to desynchronosis)

• # 🇺🇸 Ryan Harrison (qualified)

• # 🇩🇪 Björn Phau (qualified)

• # 🇪🇸 Guillermo García-López (qualified)

• # 🇯🇵 Tatsuma Ito (second round)

• # 🇷🇺 Evgeny Donskoy (second round)

• # 🇫🇷 Guillaume Rufin (first round)

• # 🇸🇮 Blaž Kavčič (qualifying competition)

Qualifiers
• # João Sousa

• # 🇺🇸 Ryan Harrison

• # 🇩🇪 Björn Phau

• # 🇪🇸 Guillermo García-López