To reach the Majors, a ballplayer must not only possess natural ability and world-class skills but must also overcome nearly insurmountable odds. The journey is not possible without extreme dedication. Along the way mentors play a large role, and circumstances must align. For an elite few, years of effort and perseverance culminate with putting on a big-league uniform.

Drawing on original interviews with more than 100 players who debuted between 1961 and 2018, this collection presents their first-person stories of how they were called-up to play Major League Baseball.