He had trailed since the second but levelled on the 17th and sank a 10ft par putt on 18 for a half, sparking jubilation.
"My memories are still very strong and vivid of that day," said McGinley. "It was down to fate more than anything else. To hole the putt the way I did was something you dream of as a boy.
"It was a wonderful occasion. It was a moment I wish I could have shared with everyone, that explosion of joy."