McMahan was the primary closer for the Wolf Pack in his junior season, recording a team-high six saves to go with his 5-2 record in his 25 appearances (also a team-high). The Criminal Justice major from Las Vegas made his only start of the season in the finals of the Mountain West tournament, and was named to the NCBWA Stopper of the Year watch list during the preseason. Prior to joining the Wolf Pack, McMahan was named to the first-team all-state, all-Southern-Nevada, all-conference, and all-region teams in his senior season in high school.