2021 Swiss Open Gstaad
Date	19–25 July
Edition	53rd
Category	ATP Tour 250 Series
Draw	28S / 16D
Prize money	€419,470
Surface	Clay / outdoor
Location	Gstaad, Switzerland
Venue	Roy Emerson Arena
Champions
Singles
Casper Ruud
Doubles
Marc-Andrea Hüsler / Dominic Stricker
← 2019 · Swiss Open Gstaad · 2022 →

The 2021 Swiss Open Gstaad was a men's tennis tournament played on outdoor clay courts. It was the 53rd edition of the Swiss Open, and part of the ATP Tour 250 Series of the 2021 ATP Tour. It took place at the Roy Emerson Arena in Gstaad, Switzerland, from 19 July through 25 July 2021.^[1]

Champions

Singles

• Casper Ruud def. Hugo Gaston, 6–3, 6–2

Doubles

• Marc-Andrea Hüsler / Dominic Stricker def. Szymon Walków / Jan Zieliński, 6–1, 7–6^(9–7)

Points and prize money

Point distribution

Prize money

_{*per team}

Singles main draw entrants

Seeds

Country	Player	Rank1	Seed
CAN	Denis Shapovalov	10	1
ESP	Roberto Bautista Agut	14	2
NOR	Casper Ruud	16	3
CHI	Cristian Garín	18	4
ARG	Federico Delbonis	48	5
FRA	Benoît Paire	51	6
SRB	Laslo Đere	57	7
ESP	Feliciano López	90	8

• ¹ Rankings are as of July 12, 2021 ^[2]

Other entrants

The following players received wildcards into the main draw:

• Johan Nikles
• Leandro Riedi
• Dominic Stricker

The following players received entry from the qualifying draw:

• Zizou Bergs
• Sandro Ehrat
• Vít Kopřiva
• Oscar Otte

The following players received entry as lucky losers:

• Enzo Couacaud
• Kacper Żuk

Withdrawals

Before the tournament

• Facundo Bagnis → replaced by Juan Ignacio Londero
• Roberto Carballés Baena → replaced by Tallon Griekspoor
• Federico Coria → replaced by Hugo Gaston
• Norbert Gombos → replaced by Dennis Novak
• Yannick Hanfmann → replaced by Kacper Żuk
• Philipp Kohlschreiber → replaced by Enzo Couacaud
• Kamil Majchrzak → replaced by Marc-Andrea Hüsler
• Dominic Thiem → replaced by Arthur Rinderknech
• Jo-Wilfried Tsonga → replaced by Marc Polmans
• Fernando Verdasco → replaced by Thiago Seyboth Wild

Retirements

• Tallon Griekspoor
• Marc-Andrea Hüsler

Doubles main draw entrants

Seeds

Country	Player	Country	Player	Rank1	Seed
NED	Robin Haase	NED	Matwé Middelkoop	79	1
URU	Ariel Behar	ECU	Gonzalo Escobar	96	2
MON	Hugo Nys	ITA	Andrea Vavassori	130	3
SWE	André Göransson	DEN	Frederik Nielsen	160	4

• ¹ Rankings are as of 12 July 2021.

Other entrants

The following pairs received wildcards into the doubles main draw:

• Marc-Andrea Hüsler / Dominic Stricker
• Jakub Paul / Leandro Riedi

Withdrawals

Before the tournament

• Kamil Majchrzak / Szymon Walków → replaced by Szymon Walków / Jan Zieliński
• Elias Ymer / Mikael Ymer → replaced by Dustin Brown / Tristan-Samuel Weissborn
• Yannick Hanfmann / Marc Polmans → replaced by Zizou Bergs / Tallon Griekspoor

During the tournament

• Zizou Bergs / Tallon Griekspoor

Retirements

• Sander Arends / David Pel