Mark Zagunis and the South Jersey Arsenal Blue (NJ) played at Cooperstown Dreams Park during Week 5 in 2005. Mark tied for 5th place in the King of Swat final. His memories of the entire week included the fields, vising the National Baseball Hall of Fame, the clubhouses and pin trading.

Mark's baseball career continued at Holy Cross High School (Delran, NJ) where he also played football and basketball. On the diamond, he lettered all four years with 103 career starts and finished with a .538 batting average with 30 home runs, 156 runs scored and 153 RBI. He also drew 119 walks and stole 84 bases. During his senior season (2011), Mark batted .673 with six doubles, two triples, 11 home runs, 43 runs scored, 44 RBI and 25 stolen bases. His accolades included all-state, all-conference and all-county selections and was named a 2011 Louisville Slugger High School All-American. On the football field, Mark earned three varsity letters and was named all-conference and all-county selections. He lettered on year in basketball.

After his high school graduation, Mark attended and played baseball at Virginia Tech (Blacksburg, VA). During his freshman season (2012), the catcher and designated hitter was an All-American honoree and named to a postseason all-conference team, posting a team-high 18 multi-hit games, fourth on the team in both multi-RBI games (8) and multi-run games (9), led the team with a 13-game hitting streak and a 26-game reached base streak (longest at school since 2009), batted .344 (first on the team) with 65 hits (second), including 13 doubles (second), two triples (tied for third) and five home runs (fourth) for 97 total bases (third) and a .513 slugging percentage (third), scored 35 runs (fourth) and knocked in 34 (tied for third), drew 21 walks (third), was hit by nine pitches (tied for third) and had a .430 on-base percentage (first). Mark also led the team with 17 stolen bases in 22 attempts.

In 2013, his sophomore season at Virginia Tech, Mark was one of three Hokies to start all 62 games, third on the team with 23 multi-hit games, tied for the team lead with 15 multi-RBI games and led the team with 21 multi-run scoring games, tied for the team lead with a 14-game hitting streak and a 23-game reached base streak, batted .341 (second on the team) with 79 hits (second), including 14 doubles (third), three triples (second) and nine home runs (third) for 126 total bases (third) and a .543 slugging percentage (third) , scored 62 runs (first) and knocked in 51 (second) , drew 32 walks (second), was hit by nine pitches (tied for third), had a .433 on-base percentage (first), and also led the team with 19 stolen bases in 24 attempts.

His junior season (2014) continued to go well for Mark as he was one of four Hokies to start all 53 games, led the team with 23 multi-hit games, including eight with three (led team) and one with four, tied for the team lead with 12 multi-RBI games, was the only player in the ACC at the end of the regular season with at least 20 multi-hit games and more than 10 multi-RBI games, had a season long six-game hitting streak and reached base in 12 straight, led the team with a .330 average and 69 hits, which including 10 doubles, two triples and two home runs, for 89 total bases and a .426 slugging percentage (all second on the team), scored a team high 44 runs and drove in 39 (second), drew 32 walks (second), including a team-high five intentional, and was hit by a pitch six times (second) for a .426 on-base percentage (second), was 16-for-19 on stolen base attempts, second on the team, his 10.5 at-bat per strikeout ratio (209 AB/20 K) led the team and he was the only player with more than 90 at-bats to not ground into a double play.