The Swampscott native Sullivan pitched three innings of one-run ball during his second season at Stetson and now returns to Fraser Field for the third straight summer. He co-led the Navs with five wins last season, going 5-2 with a 4.26 ERA in 50.2 innings. Six of his 10 starts lasted at least five innings, highlighted by an eight-inning July 25 effort against Brockton during which he allowed just five hits, struck out 10 and did not issue a walk.

Sullivan earned Northeastern Conference All-Star honors for Swampscott before moving to Cheshire and being named the Western New England Prep Pitcher of the Year on two occasions. He debuted for the Navs following his graduation from Cheshire, pitching in two games during the 2018 season.