If my pitcher gives up 5 runs a game during the first five inning, and then is pulled and my offense has scored 20 runs, he is likely to notch a "win".
On the other hand if my other pitcher gives up 1 earned run a game (for a complete 9 innings) and my offense scores nothing, he will lose the game.
Which pitcher would you rather have?
That is why one should ignore the win-loss statistic in evaluating pitchers.
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