Mike Trout
On April 17, 2015, Trout became the youngest player in MLB history to reach 100 home runs and 100 stolen bases. He was 23 years and 253 days old when he reached the milestone, passing the previous record-holder, Alex Rodriguez, who had achieved it at the age of 23 years and 309 days in 1999. Trout led off the 2015 MLB All-Star Game with a home run, becoming the fourth player in All-Star Game history to do so. For the second year in a row, Trout won the All-Star Game MVP Award, becoming the first player ever to win it in consecutive years. On September 22, Trout hit his 40th home run, becoming only the second Angels player to hit 40 home runs in a season. Trout led the AL in WAR for the fourth straight year.
Joe Cicero
An all-around high school athletic standout, Cicero spent most of his 19-year baseball career in minor league baseball, with two brief stops in the major leagues 15 years apart. He signed a contract with the Boston Red Sox when he was only 16, and reached the majors in 1929 with Boston, hitting .312 with a .500 slugging average in just 10 games, an especially impressive accomplishment given that Cicero was the youngest player in the major leagues that season at age 18. The next season, he hit .167 and also lost his youngest player title to Hank Greenberg. After that, he spent the next 14 years in the minors.