1915 – For the second time in six weeks, Pirate hurler Al Mamaux combines to throw a doubleheader shutout. This time his partner is Bob Harmon, as Mamaux stops the Phils, 6 – 0, and Harmon follows with a 9 – 0 win.

This Day In Baseball

On August 7, 1915 — 1915 – For the second time in six weeks, Pirate hurler Al Mamaux combines to throw a doubleheader shutout. This time his partner is Bob Harmon, as Mamaux stops the Phils, 6 – 0, and Harmon follows with a 9 – 0 win.

Source:
Baseball Reference August 7
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game