In the Orioles sweep of the Angels, Orioles SS Luis Aparicio becomes the first major league player since George Case in 1945 to reach 300 career steals. The O’s win, 7 – 4 and 3 – 2.

This Day In Baseball

On August 21, 1963 — In the Orioles sweep of the Angels, Orioles SS Luis Aparicio becomes the first major league player since George Case in 1945 to reach 300 career steals. The O’s win, 7 – 4 and 3 – 2.

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