“If Donovan was out in the sixth when slid to first he was out my a mile and a half in the eighth when he slid home.” Cleveland Leader, July 1, 1892, p3
Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1926. “When he finally made up his mind and hastened to third, he was out by a mile as he slid in on his chest and got his uniform all dirty” (The New York Times, Oct. 3; Barry Popik).