After being swept in a three-game series by Houston at the Astrodome, the eventual World Champion Mets fall ten games behind the front-running Cubs in the first-ever NL East race. The third-place New York team will finish the season at a torrid 39-11 pace, finishing the season eight games in front of Chicago.

On August 13, 1969 — After being swept in a three-game series by Houston at the Astrodome, the eventual World Champion Mets fall ten games behind the front-running Cubs in the first-ever NL East race. The third-place New York team will finish the season at a torrid 39-11 pace, finishing the season eight games in front of Chicago.

Source:
Baseball Reference August 13
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game