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, his BABIP is down to .357, and he’s only stolen 16 bases this year after swiping 49 last season. Trout noticeably bulked up over the off-season, and he doesn’t appear to be quite as fast as he was last year. He’s still a burner, but he’s probably not in the fastest player in baseball conversation anymore. So, in that sense, my expectations for Trout regressing have been vindicated.
Except, you know, his wRC+ has fallen from 166 last year all the way down to 163 this year. The BABIP correction has essentially been canceled out by an improvement in his contact rate, so he’s just not striking out as often as he was last year and the increase in balls in play has allowed him to maintain his offensive levels from last season. And, while his stolen base totals are down, he’s still taking a ton of extra bases, which shows up in his league leading +3.3 UBR, the part of our baserunning calculation that measures value from advancing my means other than stealing a base. Trout had a +5.0 UBR last year, so he’s actually on pace to get more value from his non-steal baserunning this season than he did in 2012.
Last year, Trout was the best 20-year-old in baseball history. This year, his performance is going to give him a shot at being the best 21-year-old in baseball history.
Read the rest of this entry »