1981 – In a Pioneer League game at Helena, Lethbridge’s Sid Fernandez strikes out 21 Phillies batters. El Sid wins, 6 – 0.

This Day In Baseball

On August 21, 1981 — 1981 – In a Pioneer League game at Helena, Lethbridge’s Sid Fernandez strikes out 21 Phillies batters. El Sid wins, 6 – 0.

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Sources:
Baseball Reference August 21
National Pastime August 20
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game