The Phillies beat the Pirates, 12 – 8, in the first game of a doubleheader. Philadelphia’s Greg Luzinski and Pittsburgh’s John Milner each hit a grand slam, and Pete Rose collects his 2,427th career single to break Honus Wagner’s National League record.

This Day In Baseball

On August 5, 1979 — The Phillies beat the Pirates, 12 – 8, in the first game of a doubleheader. Philadelphia’s Greg Luzinski and Pittsburgh’s John Milner each hit a grand slam, and Pete Rose collects his 2,427th career single to break Honus Wagner’s National League record.

Source:
Baseball Reference August 5
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game