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.
Jim Derrington
Because of the size of his bonus, rules of the time required Derrington to stay on the major league roster for the next two calendar years. He was not used by the White Sox until the season finale on September 30, when he was given a start against the Kansas City Athletics. In the process, he became the youngest pitcher in major leagues to start a game since the start of the 20th century at an age of 16 years and 306 days, a distinction he still holds, with only Willie McGill in 1890 starting a game a younger age in a recognized major league. Starting against George Brunet, Derrington allowed three runs in the first two innings, but kept the game tied through the next three. In the fourth inning, Derrington recorded his first career hit, a single off of reliever Bill Harrington, becoming the youngest player in American League history to record a base hit, a record that he still owns. He was ultimately unable to score. In the sixth inning, he allowed three runs on a pair of home runs, a solo homer from Vic Power and a two-run shot to Lou Skizas. In the seventh inning, Larry Doby pinch hit for Derrington with the White Sox trailing 6-3. Despite a late rally, Chicago lost seven to six and Derrington took the loss in the game.