Young relievers and Blue Jays rookie Roberto Osuna

Last week over at Fangraphs, Chris Mitchell examined the rookie debut season of Toronto Blue Jays right-hander Roberto Osuna. As you know, Osuna jumped from A-ball to the major leagues in the spring of 2015 and performed excellently in the Jays pen, saving 20 games with a 2.58 ERA, 3.02...

By John Sickels