An in-depth look at four players who stood out at this year's New England Collegiate League All-Star Game.

HOLYOKE, Mass. — Cameron Junker has all the physical gifts to pitch in pro ball for a long time. He’s a physical 6-foot-4, 215-pound righthander with a good fastball and feel to spin his slider, and he has tantalized the coaching staff at Notre Dame with his potential during his first two seasons on campus. But one thing was holding him back from putting it all together: the mental part of the game.

“Like every Notre Dame kid, he’s a really intelligent kid,” Notre Dame pitching coach Chuck Ristano said early this year. “Sometimes that brain is your best weapon; sometimes it paralyzes you.”

It’s obvious when you speak with Junker that he’s very bright, and that he’s dedicated to his craft. And he has made big strides each of the last...