1999 – Cincinnati defeats Pittsburgh, 1 – 0, as P Pete Harnisch hurls a one-hitter. Harnisch fans 12 in his eight innings of work, allowing only a 7th-inning single to SS Mike Benjamin, and Scott Williamson pitches the hitless 9th.

This Day In Baseball

On August 19, 1999 — 1999 – Cincinnati defeats Pittsburgh, 1 – 0, as P Pete Harnisch hurls a one-hitter. Harnisch fans 12 in his eight innings of work, allowing only a 7th-inning single to SS Mike Benjamin, and Scott Williamson pitches the hitless 9th.

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Sources:
Baseball Reference August 19
National Pastime August 19
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game