Originally posted on Fangraphs  |  Last updated 6/23/13
Last year, Mike Trout was 20-years-old, and he did things that no other 20-year-old in history had ever accomplished. He’s the only 20-year-old in baseball history to post a +10 WAR season, and it wasn’t just driven by his positive fielding numbers, as his 166 wRC+ was the best hitting performance any 20-year-old has ever posted. It was an historic season in many ways, but it was also the kind of season that didn’t look repeatable. His BABIP was .383, and both his fielding and baserunning numbers were among the best in the game, but all of those variables are heavily influenced by speed, and speed peaks very early. During his run last year, I repeatedly noted that I thought Trout would probably settle in as more of a +6 to +7 WAR player, because his defense and baserunning would regress faster than his offense would improve. And, really, his BABIP, his defense, and his baserunning have regressed somewhat. Trout’s UZR is just +0.5 despite spending about half of his games in left field,
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