In the history of the NBA, no other player had scored a Game Seven series-winning field goal (defined as a field goal that put his team ahead to stay) with as little as one second remaining on the clock. Previously, the latest series-winning field goal in a Game Seven was scored by Sam Jones on April 5, 1962, when his field goal with two seconds remaining in the fourth quarter gave the Celtics a 109-107 victory over Wilt Chamberlain’s Philadelphia Warriors in Game Seven of the Eastern Division Finals.

Source: Elias Says: Sports Statistics – Stats from the Elias Sports Bureau – ESPN