| Champ: |  Milos Raonic |
| Runner: | João Sousa |
| Score: | 6–3, 3–6, 6–3 |
| Draw: | 28 |
| Seeds: | 8 |
| Type: | singles doubles |
| Before Year: | 2013 |
See main article: 2015 St. Petersburg Open. Ernests Gulbis won the last edition of the tournament held in 2013, but lost in the first round to Marcos Baghdatis.
Milos Raonic won the title, defeating João Sousa in the final, 6–3, 3–6, 6–3.
The top four seeds receive a bye into the second round.