Boston defeats the Cardinals in their debut at Braves Field, 3-1. The concrete and steel facility, which took only five months to construct, becomes the first ballpark to seat more than 40,000 fans.

On August 18, 1915 — Boston defeats the Cardinals in their debut at Braves Field, 3-1. The concrete and steel facility, which took only five months to construct, becomes the first ballpark to seat more than 40,000 fans.

Source:
Baseball Reference August 18
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game