at AT&T Park on May 17, 2017 in San Francisco, California.

In a sea of injuries this year, one has reigned king.

Before the year started, no one would have guessed that the most destructive of all injuries was the smallest. As I’m sure you’ve figured out by now, we’re going to be talking about the silent killer: the blister.

Throughout the history of baseball, blisters have been a problem for pitchers. The repeated motion of throwing a ball and guiding it with the tips of their fingers, will frequently cause blisters on even the most resilient of hands. Something so small can completely alter a pitchers throwing motion and the movement on their pitches. Despite always being a part of baseball, blisters have occurred at a frustrating rate this year.

This year, Johnny Cueto, Taijuan Walker, Aaron Sanchez, Zack Wheeler and Rich Hill have all been claimed by the blister. Combined, Sanchez and Hill have required five trips to the DL, Walker is yet to come off it, Wheeler just exited his game yesterday (5/27 in Pittsburgh) with one, and Cueto is pitching through his blister to an uncharacteristic 4.64 ERA and 4.22 FIP. The year has just begun and five players have already been affected. How many more will be taken?

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