Most people answer Kirk Gibson because of his famous homer later in the game (see my post from March 18, 2014 for more details on that homer) but it was actually Rusty Kuntz's pop fly sacrifice to 2nd base in the 5th inning that scored the go ahead and winning run.
Mr. Kuntz signed this card for me via the Kansas City Royals spring training camp in Arizona. He is currently the Royals' first base coach.