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.
Miguel Castro
Castro made his MLB debut on April 6, 2015, against the New York Yankees. He pitched 1 innings and closed out the game as the Blue Jays won 6-1. At 20 years, 103 days old, Castro became the youngest pitcher to appear for the Blue Jays, breaking a nearly 38-year-old record held by Víctor Cruz. His record was short-lived, however, as it was broken only two days later by teammate Roberto Osuna. After a poor season debut by Brett Cecil, Castro was temporarily moved to the closer role on April 9. He earned his first MLB save that night, closing out a 6–3 win over the Yankees. Castro was moved back into a regular relief role in the bullpen on April 28, after recording 4 saves in 6 opportunities. On May 3, Castro was optioned to the Triple-A Buffalo Bisons.