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.
Clayton Kershaw
On May 24, 2008, the Dodgers bought Kershaw's minor-league contract, and he was added to the active roster. Sportswriter Tony Jackson called Kershaw's debut the most anticipated start by a Dodgers pitcher since Hideo Nomo's major league debut during the 1995 season. He made his debut on May 25, starting against the St. Louis Cardinals. He struck out the first batter he faced, Skip Schumaker, the first of seven strikeouts in the game, in which he pitched six innings and allowed two runs. When he debuted, Kershaw was the youngest player in MLB, a title he held for one full year.