Spieth's extraordinary one-under-par 69 on Monday (NZT) - featuring three back-nine birdies and an eagle after he'd relinquished his three-shot overnight lead - earned the 23-year-old a tension-filled three-stroke victory at 12-under 268.
Spieth famously squandered a five-shot lead with nine holes to play at Augusta National in 2016, with Willett taking full advantage to claim his first major title thanks to a superb closing 67. "It took a bogey to do so".
His 3-iron stopped just short of one of them in front of the green, and he pitched over it to about 7 feet and holed the putt to escape with a bogey.
Then came the 13th and extraordinary scenes on Merseyside.
Spieth paid tribute to playing partner and runner-up Kuchar for the way he handled a long delay on the 13th which ended with him playing from the practice grounds. Spieth's recovery kept him in the tournament. When the wheels were coming off Jordan Spieth's game Sunday, Kuchar finally saw his dreams coming into focus.
However, the sight of his rival alone at the top of the leaderboard appeared to click a switch in Spieth, who responded with a birdie on the par-three 14th, where he was close to a hole-in-one.
"I knew we had momentum on our side and we were tied", Spieth added.
"All of a sudden, I felt and believed that I could win that golf tournament, when 30 minutes prior and really the entire day after the fourth hole, I didn't feel that way", said Spieth. He escaped with a bogey to trail by just one stroke going onto the 14th, before recovering his nerve to pick up three birdies and an eagle on his next four holes and secure the Claret Jug in astonishing fashion.
Not to go into everything that Tiger Woods has been through for the past eight years but we all essentially assumed that Tiger would blow past Nicklaus and put up an unreachable mark of major wins that would never be broken.
He said: "I'm excited for the next two weeks". In fact, the Westgate LV Superbook among others will make you lay chalk if you want to bet him to win, listing him as the -250 favorite.