Britton's most notable ITF junior tournament win was in June 2008, when he captured the International Grass Courts Championships.

In the third round, Britton sent Rice senior Bruno Rosa out of the tournament in straight sets, and then he beat Stanford’s Alex Clayton in the quarterfinals.

[5] The championship win also makes him the first freshman since 19-year-old Cecil Mamiit of USC in 1996 and the first non-seeded player since Luke Smith of UNLV in 1997.

[5] After only one semester in college, Britton announced on July 1, 2009, that he would not return to Mississippi but would instead turn professional and had already signed a contract with a sports agency, Octagon Worldwide.

Devin trained at the IMG Academy/Bollettieri Tennis Academy[7] in Bradenton, Florida where he was coached by Nick Bollettieri, David Amye and Gabe Jaramillo.