Carlos Marmol has the highest strikeout rate in MLB history

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Just before the All-Star break I wrote about how Carlos Marmol was on pace for the highest strikeout rate in baseball history among pitchers with at least 50 innings.
In the two months since then he hasn’t missed quite as many bats, but the Cubs’ closer is still on an historic track. Marmol has racked up an amazing 120 strikeouts in 68.2 innings, which works out to 15.73 strikeouts per nine innings.
Not only is that the best strikeout rate of all time, Marmol is the only pitcher to ever crack 15 per nine innings:

                    YEAR      SO/9
CARLOS MARMOL       2010     15.73
Eric Gagne          2003     14.98
Billy Wagner        1999     14.95
Brad Lidge          2004     14.93
Armando Benitez     1999     14.77
Billy Wagner        1998     14.55
Billy Wagner        1997     14.38

In terms of this season Rafael Betancourt has the second-highest strikeout rate at 12.83, which is 23 percent fewer strikeouts per nine innings than Marmol. Amazing.