There were also hole in ones for Dyland Fritteli and Tony Finau in the contest, Finau appearing to twist his ankle in celebrating.
So excited was Finau that he took off in a dead sprint, first forward, then backward, and that's when it went wrong.
No further proof needed after watching his grandson, Gary, hit a hole-in-one during the Par 3 Tournament.
Finau, with a slight limp, continued to play and finished the final two holes.
Finau continued to wave to the crowd as he hobbled back up the green before waving to his family to join him in the celebrations.More news: Intel Core i9 is the most advanced processor for laptops today
Since the contest started in 1960, nobody has ever become par-three and Masters champion in the same week.
Nicklaus called it the "No. 1" moment in his golf career, which included winning 18 majors.
But Watson's victory wasn't the only excitement in the group: Jack needed a hole in one on the 9th to tie Watson, but wasn't able to.
"What I did didn't make any difference to me".
As for Watson, who needed only eight putts on the nine holes, he joked, "That was the Watson of old". "What a day. It's one I'll never forget". That came from Nicklaus' 15-year-old grandson, Gary Nicklaus Jr., nicknamed "G.T.", who aced the ninth hole and brought his 78-year-old grandfather to tears. "I mean what a day".