| Men's Singles | |
|---|---|
| 2013 U.S. National Indoor Tennis Championships | |
| Champion |
|
| Runner-up |
|
| Final score | 6–2, 6–3 |
Jürgen Melzer was the defending champion, but lost in the first round to Igor Sijsling.
Kei Nishikori won the title, defeating Feliciano López in the final, 6–2, 6–3.