Worst lefty batters against lefty pitchers 1948-2013.

Ozzie Guillen.  At least he has the lowest OPS for the years studied, 2013 back through about 1948, which is the earliest time for pretty much full play-by-play data.  Not included: Babe Ruth, Lou Gehrig, Ty Cobb.  A minimum of 1,500 plate appearances (PA) was used to include Roger Maris, whose criticism by a fellow Yankee fan prompted this study.  Maris has the 43rd worst OPS among the 137 batters who qualified.  They include Stan Musial who had enough PA but exclude Ted Williams.

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OPS: On Base Plus Slugging averages against lefty pitchers
OPStot: OPS against all pitchers
OPSdif: OPStot - OPS
OPS%dif: OPSdif/OPStot

	OPS	OPStot	OPSdif	OPS%dif
max (best)	0.986	1.051	0.009	1.16%
min (worst)	0.553	0.626	-0.19	-19.90%
ave	0.73	0.81	-0.08	-9.77%

About midway of the 137 batters sorted ascending by OPS against lefty pitchers:

Rk

Player

OPS

OPStot

OPSdif

OPS%dif

67	Ryan Howard	0.728	0.906	-0.178	-19.65%
68	Kirk Gibson	0.731	0.815	-0.084	-10.31%
69	Steve Kemp	0.731	0.797	-0.066	-8.28%

So .730 OPS against lefties is about the middle.  Since Ozzie had an overall OPS well below there's no sense beating him up.  The five lowest OPS:

Rk	Player	OPS	OPStot	OPSdif	OPS%dif
1	Ozzie Guillen	0.553	0.626	-0.073	-11.66%
2	Rick Manning	0.562	0.658	-0.096	-14.59%
3	Omar Moreno	0.605	0.649	-0.044	-6.78%
4	Willie Davis	0.619	0.723	-0.104	-14.38%
5	Jorge Orta	0.622	0.746	-0.124	-16.62%

Ryan Howard has one of the worst OPS%dif.  Worst is the batter with the 21st worst OPS against lefties:

Rk

Player

OPS

OPStot

OPSdif

OPS%dif

21

Vic Wertz

0.668

0.834

-0.166

-19.90%

Only one lefty batter was better against lefty pitchers than overall:

Rk

Player

OPS

OPStot

OPSdif

OPS%dif

113

Ichiro Suzuki

0.784

0.775

0.009

1.16%

Suzuki had both the best and only positive OPSdif and OPS%dif.

Tuesday, March 26, 2013  Ichiro Suzuki: only lefty hitter with higher BA against lefty pitchers.

Only 24 of the 137 lefty batters had higher OPS against lefty pitchers than Suzuki .  Highest OPS:

Rk

Player

OPS

OPStot

OPSdif

OPS%dif

137

Barry Bonds

0.986

1.051

-0.065

-6.18%

Bonds also had the most home runs (HR): 227.  Babe Ruth splits are not complete but Ruth probably had fewer HR against lefties.

Biggest OPSdif:

Rk

Player

OPS

OPStot

OPSdif

OPS%dif

98

Jim Thome

0.766

0.956

-0.19

-19.87%

Oh, Roger Maris:

Rk

Player

OPS

OPStot

OPSdif

OPS%dif

43

Roger Maris

0.697

0.822

-0.125

-15.21%

Maybe Maris wasn't so bad.  Check the complete list.  Click this link to view details.  There are some surprises, including batters who had the highest batting average multiple times and a triple crown winner.