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 (Third round) 🇧🇦 Beartic 🇸🇰 Ryan Hunter-Reay (Third round) Graham Rahal (First round) 🇹🇷 Pidgeot 🇯🇵 Apolo Anton Ohno (Third round) 🇨🇿 Ueli Kestenholz (Second round) Chespin (First round) 🇬🇧 Jonathan Bald (First round)

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