The Los Angeles Angels called Mike Trout up in late April, and he played his first game with the team on April 28.
Since then, he's been one of the best players in baseball.
Trout has been excellent at the plate, hitting .354/.412/.565 with six home runs, 26 RBI, and 15 stolen bases. In the field, he's played Gold Glove-caliber defense, primarily in center field.
Trout's presence has definitely energized the Angels, as they've gone 27-15 since calling him up.
All this from a guy who's still only 20-years-old.
That got Hudson Belinsky of ESPN.com to wondering whether Trout may be in the midst of the greatest season ever by a 20-year-old ballplayer.
That thought got me to researching. A few long hours and several cups of coffee later, I came up with the following list.
Behold the 10 greatest individual seasons by 20-year-olds in Major League Baseball history.
Note: Special thanks to Baseball-Reference.com and FanGraphs for the vital intel. And for the record, I let the folks at Baseball-Reference.com determine which season was a given player's 20-year-old season.