Open champion Collin Morikawa revealed the unexpected and tasty secret to his success after winning the Claret Jug at the first attempt on Sunday.

The 24-year-old produced a blemish-free 66 in a stunning final round at Royal St George's to thwart the charge of Jordan Spieth and eclipse overnight leader Louis Oosthuizen.

Morikawa, who also won the 2020 US PGA Championship on debut, secured his second major win in eight entries after starting the day a shot behind Oosthuizen.

In the end his greatest beef was with 2017 Champion Golfer of the Year Spieth, who recovered from being two over through six holes to sign for a 66 himself, finishing two back.

But Morikawa, who saw playing partner Oosthuizen limp to a closing 71, clearly relished the challenge as he went bogey-free to make mincemeat of the field in sizzling sunshine on the Kent coast.Moritotal

But, when grilled by the media as to what the key to his triumph was, Morikawa had an answer nobody saw coming.

"The secret? Well, I never do this, but I had a burger for four straight days, so my body is probably feeling it. I know my body's feeling it," he said.

"I think I just enjoy these moments, and I talk about it so much that we love what we do. And you have to embrace it.

"You have to be excited about these opportunities, and that's how I looked at it today, especially coming down the stretch, was I'm excited. To have the Claret Jug right here in my possession for a year, I believe, I'm excited to have it."

Runner-up Spieth lamented his putting as he came up short, but Morikawa was delighted with that side of his own game.

He made a succession of potentially tricky putts, including one for birdie from around 15 feet on the 14th just after Spieth had cut the gap to one.

"Definitely one of the best [putting displays], especially inside 10 feet," he said.

"I felt like it was as solid as it's going to get. I don't think I really missed many from that distance. Especially in a major.

"I think in a major on a Sunday in contention, I wasn't thinking about anything other than making a putt.

"I'm going to tell myself probably tomorrow: 'Why can't I keep doing that all the time?'.

"But you know, I'm going to try to figure out what worked and use that for the future because I know I can putt well. I know I can putt well in these pressure situations. I've just got to keep doing that."