...the average platoon split for a right handed batters is 15 points of wOBA...that's not exactly OPS...and there's no direct way to convert wOBA into an estimate of the OPS split...but let's assume for the sake of argument that all Mariner hitters actually have league average platoon splits and face a league average percentage of lefty and righty pitchers (we know the second part is not true, but go with it here)...LHP get about 29.6% of the total plate appearances per B-Ref, so a 15 point wOBA split would be achieved by taking the batter's total wOBA, moving his vs. RHP wOBA down by 0.015*0.30 (about 0.005) and moving his vs. LHP wOBA up by 0.010.
Lopez' wOBA in 2009 was .325, so you'd expect him to hit .320 against righties and .335 against lefties.
Interestingly, the average split for a left handed batter is about 0.030 points of wOBA...twice as much. Probably because they don't get to face their weak side very often. Ken Griffey Jr. wOBA'd .323 last year...you would expect him to wOBA .303 against lefties and .333 against righties.
Let's now assume that Ichiro, Figgins, Lopez and Bradley - all of whom have established that they don't have normal platoon splits (two of whom switch hit so you expect the splits to be muted anyway) have no platoon split, and let's assume the rest behave normally.
Projected wOBA vs. LHP:
RF) Ichiro! .355
3B) Figgins .345
DH) Bradley .370
1B) Garko .355
CF) Gutierrez ..345
2B) Lopez .335
C) Catchers .310
SS) Wilson .305
LF) Byrnes .325
Projected wOBA vs. RHP:
RF) .Ichiro! .355
3B) Figgins .345
LF) Bradley .370
CF) Gutierrez .330
DH) Griffey .335
2B) Lopez .320
1B) Kotchman .340
C) Catchers .295
SS) WIlson .290
So yes...the line-up vs. RP is weaker...but we're not looking at a major disaster on our hands...just...a potential weakness.
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