Although strikeouts in Major League Baseball have declined slightly this season, the overall trajectory in the last decade has been a precipitous rise. Meanwhile, walks have been gradually dwindling over the same span. This divergence has played a role in the overall decline in offense, however, some players have been able to buck these prevailing trends.
Major League Baseball BB and K Rates, 2004 to 2013

Note: Data is as of the August 5, 2013.
Source: fangraphs.com
In 2011, David Ortiz enjoyed a historic drop in his strikeout rate, an accomplishment made even more extraordinary by the overall environment in which it was achieved as well as his ability to maintain that level over the two seasons that have followed. Although not to the extreme of Ortiz, an increasing number of hitters have been able to reign in their strike out total this season. Among the 95 players with a qualified season both in 2012 and so far in 2013, only 39 have struck out more often, while 54 have gone down on strikes less frequently.
Top-10 2013 Strikeout Rate Declines and Increases

Note: Data is as of the August 5, 2013. Includes only a comparison of consecutive qualified seasons.
Source: fangraphs.com
Norichika Aoki leads the way among those curbing their strikeouts. His 43% decline in strikeouts per plate appearance ranks first among all qualified hitters this season, but because he is working off a smaller base, the corresponding four percentage point drop in the real rate doesn’t register in the top-10. In terms of actual change in strikeout rate, Jason Heyward ranks first, having shaved 6.3 percentage points off his ratio.
While most qualified hitters have lowered their strikeout rates, a sizable minority continue to rack up an increasing number. Heading that brigade is Prince Fielder, whose strikeouts per plate appearance have increased by 42%. Carlos Gonzalez isn’t far behind with a 36% increase, which, though third on a ratio basis, has resulted in the largest percentage point increase.
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