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.
Butch Wynegar
The Twins invited him to their spring training camp in 1976, where he successfully made the team, never having played Double or Triple-A baseball. To date, Wynegar is the only catcher to have ever jumped directly from A-ball to the majors.
Wynegar proved to be adept both behind the plate and batting. In 1976 he was the fourth-youngest baseball player in the AL. His first major league home run was a game-winner off Catfish Hunter on April 18, 1976. Wynegar was batting .294 with six home runs and 37 runs batted in at the 1976 All-Star break to be named to the American League All-Star team his rookie season. He drew a walk in his only at-bat, and became the youngest player at the time to appear in an All-Star Game (20 years, 212 days). For the season, Wynegar had 650 putouts, second in the league behind Jim Sundberg, and batted .260 with ten home runs and 69 RBIs and was 9th in the league in walks, with 79. He finished second in the 1976 American League Rookie of the Year balloting to Mark Fidrych, and was named "The Sporting News" Rookie of the Year.