Sela achieved a notable success in 2015 at Challenger level when he won the Odlum Brown Vancouver Open for the fourth time. Sela's victory made him just the fifth man in history to win a particular ATP Challenger tournament four or more times, and also moved him into sole possession of second place on the all-time list of Challenger title wins, with 24. In May 2015 he won in Batman, Turkey, defeating Blaz Kavcic in the final, in August 2015 he won in Vancouver, Canada, defeating John-Patrick Smith in the final, and in November 2015 he won in Suzhou, China.