2021 Geneva Open
The 2021 Geneva Open was a men's tennis tournament played on outdoor clay courts. It was the 18th edition of the Geneva Open and part of the ATP Tour 250 series of the 2021 ATP Tour. It took place at the Tennis Club de Genève in Geneva, Switzerland, from May 15 through May 22, 2021.
Champions
Singles
- Casper Ruud def. Denis Shapovalov, 7–6, 6–4
Doubles
- John Peers / Michael Venus def. Simone Bolelli / Máximo González, 6–2, 7–5
Points and prize money
Point distribution
Prize money
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q2 | Q1 |
| Singles | €41,145 | €29,500 | €21,000 | €14,000 | €9,000 | €5,415 | €2,645 | €1,375 |
| Doubles* | €15,360 | €11,000 | €7,250 | €4,710 | €2,760 |
*per team
Singles main draw entrants
Seeds
- Rankings are as of May 10, 2021.
Other entrants
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
- Daniel Altmaier
Withdrawals
- Alexander Bublik → replaced by Tennys Sandgren
- Borna Ćorić → replaced by Feliciano López
- Alejandro Davidovich Fokina → replaced by Thiago Monteiro
- Alex de Minaur → replaced by Jordan Thompson
- Cristian Garín → replaced by Daniel Altmaier
- Filip Krajinović → replaced by Salvatore Caruso
- Jan-Lennard Struff → replaced by Fernando Verdasco
Retirements
- Stefano Travaglia
Doubles main draw entrants
Seeds
- Rankings are as of May 10, 2021.
Other entrants
- Arthur Cazaux / Li Hanwen
- Marc-Andrea Hüsler / Dominic Stricker
Withdrawals
- Alex de Minaur / Jordan Thompson → replaced by Nathaniel Lammons / Jackson Withrow
- Wesley Koolhof / Jean-Julien Rojer → replaced by Marin Čilić / Andrey Golubev
- Nicholas Monroe / Reilly Opelka → replaced by Nicholas Monroe / Benoît Paire
- Rajeev Ram / Joe Salisbury → replaced by Pablo Cuevas / Guido Pella