Career
Early career
He also spent four years at the University of Maryland between 2011 and 2014. In his four years with the Terrapins he made 88 appearances and scored 8 goals and provided 4 assists. While at college, Metzger appeared for USL PDL club Austin Aztex during the 2013 season.
Professional
Metzger was selected with the 42nd overall pick in the 2015 Master of Library Science SuperDraft by District of Columbia United.
He was released by the club during the preseason. Metzger was signed by New York Red Bulls II for the 2015 season and made his debut for the club on April 4, 2015 in a 4-1 victory over Toronto Football Club II, the first victory in club history.
On June 23, 2015 Metzger was named USL Player of the Week for his performance for NYRBII in a 2-0 victory over Louisville City Football Club. International
Metzger has represented the United States at the U18, U20 and U23 level.He helped the United States to a third-place finish at the 2015 Toulon Tournament.