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When Mauer sustained that fateful brain injury, he was batting .324 with a .404 on-base percentage, and was on pace to finish with a career-high 670 plate appearances. The prior season, he had led the league with a .416 OBP, even garnering a few down-ballot MVP votes.
It had been an impressive rebound from that dreadful 2011 campaign where "bilateral leg weakness" became a running joke on talk radio as Mauer missed half the season and finished with the worst OPS of his career.
Now, the pedestrian performance level in 2011 that once looked like an outlier has become normative for the 32-year-old:
2010: .327/.402/.469
2011: .287/.360/.368
2012: .319/.416/.446
2013: .324/.404/.476
2014: .277/.361/.371
2015: .265/.338/.380
While the underlying issues at that point were more structural, relating to weakness or soreness in the lower half of his body that eventually improved, the basis for his drop-off over the past two years is much more complicated and murky. Mauer told the Pioneer Press that he occasionally battled blurred vision and light sensitivity in 2014 and 2015, helping explain an OPS in those two seasons that is 120 points below his career benchmark.
Those are fairly typical after-effects for a bad concussion, and after living through it with Justin Morneau, Twins fans are all too aware that such symptoms can linger on indefinitely.
For Mauer, it's not hard to see how even a slight diminishment of the senses could be a major drain on his production.
Baseball is a game of split-second reactions by nature, and even more so for Mauer, who has never been a "guess hitter" by any stretch of the imagination. His numerous batting titles were attributable in large part to his uncanny ability to decide late on a borderline two-strike pitch, reach out and flick it the other way for a single.
It has been evident enough from watching him over the past two years that his perceptiveness has dulled. Mauer whiffs on pitches that he used to waste with a foul. His ground ball rates have climbed as the consistency of solid sweetspot contact has dropped. He has always relied on taking the first pitch or two of an at-bat because of his comfort zone when behind in the count, but now that's turning into a danger zone. It's lethal for a hitter of his profile.
The good news in all of this is that brain injuries, like all injuries, tend to heal progressively over time, even if the process is more gradual and ambiguous than we'd like. The further Mauer moves away from his last concussion, the sharper he is likely to be, and the Twins are wisely protecting him from future reoccurrences by ruling out any notion of a return to catcher.
For his part, Mauer says he has been doing specific exercises to strengthen his eyes, and will try wearing sunglasses to counteract the strain of bright day games.
Ideally the collective effects of these efforts, along with his last head trauma incident shrinking in the rear view mirror, will help Mauer climb back somewhere close to the level he was at prior to August 2013.
With all of the talk about Miguel Sano, Byron Buxton, Byung Ho Park and others, Mauer remains a hugely critical piece in the lineup, capable of single-handedly shifting the offense into another gear if he's getting on base constantly in front of the big boppers.







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