No Night Owl

How’s this for a split? Mike Mussina, 2004-05:
Day games: 7-4 in 14 starts, 3.02 ERA in 92.1 IP
Night: 17-13 in 41 starts, 5.01 ERA in 244.1 IP
The odd thing is, Mussina’s K/9 and BB/9 are about the same in both situations – but his HR/9 rise from 0.88 by day to 1.33 by night, accounting for the difference. Mussina hadn’t shown a similar pattern before 2004, so it’s hard to say if this is just random luck.

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