Although neither man began Opening Day 2015 on the major league roster, Houston Astros shortstop Carlos Correa and Chicago Cubs third baseman Kris Bryant easily won AL & NL Rookie of the Year honors, respectively.
Correa didn't make his big league debut until June. In only 99 games for Houston, Correa hit .279 with 22 home runs and 68 RBI and was a key contributor to the Astros first post-season berth in a decade. At 21, Correa is just scratching the surface.
Meanwhile, Bryant hit .275 with 26 home runs and 99 RBI in 151 games. Although he struck out a NL leading 199 times, he did make the NL All-Star Team and reached the post-season with the Cubs. Like Correa, we are going to hear a lot from Bryant in the years to come.