For the 2012 season, Baseball-reference.com’s formula for pitching Wins Above Replacement (bWAR) makes Tampa’s David Price the pitcher with the most bWAR among all left-handed pitchers in the majors, by a small margin over Clayton Kershaw of the Dodgers and Matt Harrison of the Rangers (Harrison’s 6.2 pitching bWAR was the highest season total ever for a lefty pitching for the Rangers franchise, breaking Jon Matlack’s record from 1978). Over the past five seasons, the bWAR formula has produced six different major league season leaders in the category of most pitching bWAR among lefty pitchers:
2012 David Price
2011 Cliff Lee
2010 Clayton Kershaw
2009 tie, C.C. Sabathia and John Lester
2008 Johan Santana
Over major league history, there have been several eras of this kind of extended multi-year diversity when looking at the top bWAR lefty in the majors each season, but there have also been periods of dominance by a single pitcher. A full table of each season’s top lefty by pitching bWAR, going back to 1901, is after the jump, along with some notes on the list. Continue reading