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.
Prince Fielder
Fielder earned his first call-up to Major League Baseball on June 13, 2005. He served as the designated hitter for the Brewers during interleague play. With Lyle Overbay serving as the Brewers' regular first baseman, Fielder was sent back down to the Sounds after the end of interleague play. Fielder was again called up to the Majors on August 17, 2005, and went on to finish the season with the Brewers, where he was used as a pinch-hitter. He was the 6th-youngest player in the league.