On July 31, 1994 — The Giants beat the Rockies, 9 – 4, as 3B Matt Williams hits his 39th and 40th home runs of the year. This gives him a new National League mark for homers through July. The previous standard was 36. The all-time record of 41 was set by Babe Ruth in 1928, and tied by Jimmie Foxx four years later.
Source:
Baseball Reference July 29
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game