Since 1990, 10 pitchers have thrown perfect games. The nine who aren't Matt Cain combined to throw 56 2/3 innings in their next starts, with a combined 57 hits allowed, 40 runs allowed, 35 earned runs allowed, 17 walks allowed. That's 8.2 baserunners per start, a 1.31 WHIP, and a 5.56 ERA.
Since 2000, 10 pitchers have allowed 18 or more baserunners in a game. One, Jimmy Anderson, never started again. The rest combined to throw 57 1/3 innings in their next starts, with a combined 48 hits allowed, 21 runs allowed, 19 earned runs allowed, and 17 walks allowed. That's 7.2 baserunners per start, a 1.13 WHIP, and a 2.98 ERA.
(Previously: In Bunches.)
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