On September 28, 2011 — Eric O’Flaherty, who induces a double play from the only batter he faces in the Braves’ 4-3 loss to Philadelphia, finishes the season with a microscopic 0.98 ERA. The 26 year-old southpaw’s earned run average is the lowest ever posted by a pitcher with 75 or more appearances.
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Sources:
Baseball Reference September 28
National Pastime September 28
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game