Milt Pappas debuted as a teenager with the Baltimore Orioles in 1957, and he would become a permanent part of the O's rotation the year after. An All-Star in both 1962 and 1965, Pappas was coming off two straight sub-three ERA and two 16-Win years and before he was packaged out to the Cincinnati Reds in exchange for future Hall of Famer, Frank Robinson.
One of the more unheralded infielders in recent memory was Placido Polanco, a Dominican known for his time with the Philadelphia Phillies and Detroit Tigers.
Curt Simmons made his Major League debut with the Philadelphia Phillies in 1947, and after a few seasons, the hurler would show himself off as one of the best southpaws in the National League.
Mel Stottlemyre is known more for his work as a Pitching Coach for the New York Yankees, where he won four World Series Rings, after winning one with the Mets. This was impressive, but it should not overshadow what he was as a player.