On August 4, 1982 — After driving in the winning run in the Mets’ 7-4 victory over the Cubs, Joel Youngblood, who is traded to the Expos during the game, flies to Philadelphia and singles for Montreal to become the first player to have a hit for two different teams on the same day in different cities. The 30 year-old All-Star collects his two historic hits off two future Hall of Famers, a single off Ferguson Jenkins in Chicago, and gets his other knock off Steve Carlton in the City of Brotherly Love.

Source:
Baseball Reference August 4
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game