See main article: 2013 If Stockholm Open.
Grigor Dimitrov defeated David Ferrer in the final, 2–6, 6–3, 6–4 to win the singles tennis title at the 2013 If Stockholm Open. It was his maiden ATP Tour title.
Tomáš Berdych was the defending champion, but chose not to compete.
The first four seeds received a bye into the second round.