From Wikipedia:
The 1975 Rose Bowl was the 61st edition of the college football bowl game, played at the Rose Bowl in Pasadena, California, on Wednesday, January 1. The fifth-ranked USC Trojans of the Pacific-8 Conference defeated #3 Ohio State Buckeyes of the Big Ten Conference, 18–17 in one of the most exciting games in the history of the Rose Bowl.[3][4][5][6][7]
After a touchdown pass with two minutes remaining to draw within a point, USC quarterback Pat Haden passed to Shelton Diggs for a two-point conversion to take the lead.[3][4][5][6] It gave the Trojans the Rose Bowl victory and the UPI coaches poll national title.
This was the third consecutive year for these teams in the Rose Bowl: USC won in 1973, Ohio State in 1974.