The 2015 Geneva Open was a men's tennis tournament played on outdoor clay courts. It was the 1st edition of the Geneva Open and part of the ATP World Tour 250 series of the 2015 ATP World Tour. It took place at the Tennis Club de Genève in Geneva, Switzerland, from May 17 through May 23, 2015.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Stan Wawrinka | 4 | 1 | ||
| Marin Čilić | 10 | 2 | ||
 Spain | Pablo Andújar | 43 | 3 | |
| Benjamin Becker | 44 | 4 | ||
 Austria | Andreas Haider-Maurer | 47 | 5 | |
| João Sousa | 51 | 6 | ||
 Cyprus | Marcos Baghdatis | 60 | 7 | |
 Russian Federation | Mikhail Youzhny | 61 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Steve Darcis →replaced by Jan-Lennard Struff Marcel Granollers →replaced by Ričardas Berankis
Vasek Pospisil →replaced by Thomaz Bellucci
Radek Štěpánek →replaced by Teymuraz Gabashvili| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 Sweden | Robert Lindstedt | Austria | Jürgen Melzer | 65 | 1 | |
 Colombia | Juan Sebastián Cabal | Colombia | Robert Farah | 73 | 2 | |
| Andre Begemann | Austria | Julian Knowle | 78 | 3 | ||
| Treat Huey | Scott Lipsky | 83 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
See main article: 2015 Geneva Open – Singles.
Thomaz Bellucci defeated João Sousa, 7–6(7–4), 6–4See main article: 2015 Geneva Open – Doubles.
Juan Sebastián Cabal / Robert Farah defeated Raven Klaasen / Lu Yen-hsun, 7–5, 4–6, [10–7]
