Randy Johnson
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Randy Johnson has the most strikeouts by a left handed pitcher. He also has the second most strikeouts all-time and over 300 wins.
Johan Santana with 265 strikeouts in 2004.
In 2012, Justin Verlander of the Detroit Tigers, had the most strikeouts with 239.
At the time of this question, Mark Buehrle had the most strikeouts, but currently Freddy Garcia does.
Randy Johnson - 19