2015 Citi Open – Men's Singles
| Men's Singles | |
|---|---|
| 2015 Citi Open | |
| Champion |
 Kei Nishikori
|
| Runner-up |
 John Isner
|
| Final score | 4–6, 6–4, 6–4 |
Milos Raonic was the defending champion, but chose not to participate this year.
Kei Nishikori won the title, defeating John Isner in the final, 4–6, 6–4, 6–4.
All seeds receive a bye into the second round.
Click on the seed number of a player to go to their draw section.
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