Collin Morikawa admits he will have to reassess his goals after making history with a nerveless victory in the 149th Open on his championship debut.

Morikawa, who won the 2020 US PGA on just his second major start, carded a superb closing 66 at a sun-baked Royal St George's to become the first player to win two different majors at their first attempt.

The 24-year-old's winning total of 15 under par left him two shots clear of three-time major winner Jordan Spieth, with US Open champion Jon Rahm and 54-hole leader Louis Oosthuizen two strokes further back.

"I felt like it was as solid as it's going to get, especially in a major," Morikawa said of his putting. "In a major, on a Sunday in contention, I wasn't thinking about anything other than making a putt.

"I'm probably going to tell myself tomorrow why can't I keep doing that all the time? But I'm going to try to figure out what worked and use that for the future because I know I can putt well in these pressure situations. I've just got to keep doing that.

"Everything about my stats say I'm not a good putter. I feel like I can get a lot better. But in these situations I feel like everything is thrown off the table. Forget about all your stats, it's who can perform well in these situations.

"That's why I think over the past few majors you've seen a lot of the same names up there, because they believe in their game and they're able to bring it out in these big moments. Thankfully I was able to put it out there on Sunday and close it out."