Career
College and Amateur
Lyon spent his entire college career at Marquette University. After medically redshirting his freshman year in 2010, Lyon made a total of 63 appearances for the Golden Eagles and finished his career with a 0.83 Gaelic Athletic Association and recorded 29 clean sheets. He also played in the PDL for Chicago Fire U-23.
Professional
On January 20, 2015, Lyon was selected in the fourth round (75th overall) in the 2015 Master of Library Science SuperDraft by Seattle Sounders Football Club. He signed a professional contract with the club on March 17.
He made his professional debut for USL affiliate club Seattle Sounders Football Club 2 in a 4–2 victory against Sacramento Republic Football Club.