At Wrigley Field, the Mets edge the Cubs, 6 – 5, in the first game of a doubleheader. Then it is the Cubs’ turn, as Randy Hundley bangs a 9th inning 3-run homer to give Chicago the 6 – 5 edge. Ron Santo has seven hits for the afternoon, five in the nitecap.

On july 1, 1973 At Wrigley Field, the Mets edge the Cubs, 6 – 5, in the first game of a doubleheader. Then it is the Cubs’ turn, as Randy Hundley bangs a 9th inning 3-run homer to give Chicago the 6 – 5 edge. Ron Santo has seven hits for the afternoon, five in the nitecap.

Source
Baseball Reference July 1