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Originally Posted by Luis_Rivera
Well I wouldn't use either without looking at context of the era for ERA. After doing so, I think you'd be a fool to choose W-L record over that.
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But here's the deal... once you reach a certain point, there are very, very few pitchers whose W-L record does not accurately reflect their value. Except relief pitchers, of course. Even modern pitchers, once they get past 60 or 70 career decisions, present you with a pretty accurate picture of their worth. Not as accurate as WARP3 or ERP, of course, but, counterintuitively, better than ERA and more illuminating than ERA+ as well.
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Pitchers are only responsible for a portion of the game. How the hell could Pedro Martinez control his relievers imploding after leaving them with leads in the 2003 season that left him with just 14 wins? Or Randy Johnson, who was the best pitcher in the NL last year with a 16-14 record because he got negative run support?
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Pedro Martinez has the highest winning percentage of any active player. Randy Johnson IIRC is 5th, behind Pedro, Moose, Clemens, and 2 guys who have a lot of career left to lower that metric (Hudson and Mulder).Not the best of examples...