 Sepulveda attended Baylor University, where he played for the Baylor Bears football team from 2002 to 2006.He was a walk-on to the football team as a linebacker, and after a redshirt freshman season (despite not having punted since junior high) became the Bears' starting punter, earning a scholarship after the 2003 season.He won the Ray Guy Award tapping him as the best college punter in 2004 and 2006, and was recognized as a consensus first-team All-American in 2004 and a unanimous first-team All-American in 2006.