2023 Swiss Indoors

The 2023 Swiss Indoors was a men's tennis tournament played on indoor hard courts. It was the 52nd edition of the event, and part of the 500 series of the 2023 ATP Tour. It was held at the St. Jakobshalle in Basel, Switzerland, from 23 October until 29 October 2023. Sixth-seeded Félix Auger-Aliassime won his second consecutive singles title at the event.

Singles

 * 🇨🇦 Félix Auger-Aliassime def. 🇵🇱 Hubert Hurkacz, 7–6(7–3), 7–6(7–5)

Doubles

 * 🇲🇽 Santiago González / 🇫🇷 Édouard Roger-Vasselin def. Hugo Nys / 🇵🇱 Jan Zieliński,  6–7(8–10), 7–6(7–3), [10–1]

Seeds

 * Rankings are as of 16 October 2023

Other entrants
The following players received wildcards into the singles main draw:
 * 🇨🇦 Félix Auger-Aliassime
 * Dominic Stricker
 * Leandro Riedi

The following player received entry into the singles main draw as a special exempt:
 * 🇺🇸 Marcos Giron

The following players received entry from the qualifying draw:
 * 🇱🇧 Benjamin Hassan
 * 🇦🇺 Christopher O'Connell
 * Alexander Shevchenko
 * Botic van de Zandschulp

The following player received entry as a lucky loser:
 * 🇧🇷 Thiago Seyboth Wild

Withdrawals

 * 🇪🇸 Carlos Alcaraz → replaced by Stan Wawrinka
 * 🇪🇸 Alejandro Davidovich Fokina → replaced by 🇩🇪 Yannick Hanfmann
 * 🇷🇸 Laslo Djere → replaced by 🇧🇷 Thiago Seyboth Wild
 * 🇨🇦 Milos Raonic → replaced by 🇷🇸 Miomir Kecmanović

Seeds

 * 1 Rankings as of 16 October 2023

Other entrants
The following pairs received wildcards into the doubles main draw:
 * Mika Brunold / Marc-Andrea Hüsler
 * Leandro Riedi / Dominic Stricker

The following pair received entry from the qualifying draw:
 * 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens

The following pair received entry as lucky losers:
 * 🇷🇸 Nikola Ćaćić / 🇷🇴 Victor Vlad Cornea

Withdrawals

 * 🇪🇸 Marcel Granollers / 🇦🇷 Horacio Zeballos → replaced by 🇷🇸 Nikola Ćaćić / 🇷🇴 Victor Vlad Cornea