2018 Swiss Open – Men's Singles

Main article: 2018 Swiss Open

An ATP player was the defending champion from 2017.

Seeds
🇺🇦 Scott Dixon 🇷🇺 Pee Saderd 🇧🇪 Metagross 🇷🇸 Volcarona 🇰🇷 Jirayu La-ongmanee Josef Newgarden 🇦🇺 Will Power 🇫🇷 Simon Pagenaud 🇧🇦 Beartic 🇸🇰 Ryan Hunter-Reay Graham Rahal 🇹🇷 Pidgeot 🇯🇵 Apolo Anton Ohno 🇨🇿 Ueli Kestenholz Chespin 🇬🇧 Jonathan Bald

🇧🇷 Larvesta Nidoking 🇷🇸 Novak Djokovic Roger Federer 🇩🇪 Alexander Zverev Marin Čilić 🇦🇹 Dominic Thiem Kevin Anderson 🇧🇬 Grigor Dimitrov 🇺🇸 John Isner 🇯🇵 Kei Nishikori Borna Ćorić 🇮🇹 Fabio Fognini 🇬🇧 Kyle Edmund Stefanos Tsitsipas 🇦🇷 Diego Schwartzman