Cassevah attended Pace High School where he was named all-state as a sophomore and junior.

A football-related injury required him to undergo Tommy John surgery and miss his senior baseball season.

He was highly regarded as a college baseball recruit and had verbally committed to play at Louisiana State on a full scholarship.

He became a reliever in 2007 and performed well, going 2–1 with a 2.75 ERA in 24 combined relief appearances for the Orem Owlz and Cedar Rapids Kernels.

On June 13, 2011, Cassevah was recalled from AAA Salt Lake to replace the injured Fernando Rodney.