The 2023 Swiss Open Gstaad (also known as the EFG Swiss Open Gstaad for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts. It was the 55th edition of the Swiss Open, and part of the ATP Tour 250 Series of the 2023 ATP Tour. It took place at the Roy Emerson Arena in Gstaad, Switzerland, from 17 through 23 July 2023.[1]
See main article: 2023 Swiss Open Gstaad – Singles.
Pedro Cachin def. 
Albert Ramos Viñolas, 3–6, 6–0, 7–5See main article: 2023 Swiss Open Gstaad – Doubles.
Marcelo Demoliner / Matwé Middelkoop, 7–6(10–8), 6–2| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | 250 | 150 | 90 | 45 | 20 | 0 | 12 | 6 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| Singles | €85,605 | €49,940 | €29,355 | €17,010 | €9,880 | €6,035 | €3,020 | €1,645 | ||
| Doubles* | €29,740 | €15,910 | €9,330 | €5,220 | €3,070 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Spain | Roberto Bautista Agut | 23 | 1 | |
 Serbia | Miomir Kecmanović | 41 | 2 | |
 Italy | Lorenzo Sonego | 42 | 3 | |
| Yannick Hanfmann | 45 | 4 | ||
 China | Zhang Zhizhen | 52 | 5 | |
| Spain | Roberto Carballés Baena | 57 | 6 | |
 Sweden | ||||
| Serbia | Laslo Djere | 60 | 8 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Félix Auger-Aliassime → replaced by 
Arthur Rinderknech
Jiří Lehečka → replaced by Jaume Munar Denis Shapovalov → replaced by Stan Wawrinka
Dominic Thiem Mikael Ymer → replaced by 
Otto Virtanen| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Brazil | Marcelo Demoliner | Matwé Middelkoop | 81 | 1 | ||
| France | Sadio Doumbia | France | Fabien Reboul | 91 | 2 | |
| Robin Haase | Austria | Philipp Oswald | 99 | 3 | ||
| Romain Arneodo | Austria | Sam Weissborn | 105 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
Sriram Balaji / Jeevan Nedunchezhiyan → replaced by Sriram Balaji / Zhang Zhizhen Roberto Carballés Baena / 
Luis David Martínez → replaced by 
Zizou Bergs / Jurij Rodionov
Jamie Murray / 
Michael Venus → replaced by 
Boris Arias / Federico Zeballos Arthur Rinderknech / Sem Verbeek