Nationals top prospect Juan Soto didn't quite homer in his first big league at-bat (he struck out in a pinch hit appearance against the Dodgers on Sunday), but his first hit was a homer on the first pitch of his first MLB start. The 19-year-old Dominican prospect is the latest highly-touted player to make headlines in his arrival at the big leagues, but will Soto fulfill his potential or bust? Major League Baseball is littered with great moments from young players upon their arrival in "The Show." Below is a smattering of great MLB firsts from some legends, some busts, and some middling players forgotten to time.