Despite the defeat, the former British Open champion has insisted that he has no regrets over his performance last weekend.
"Every second on the flight I was thinking about what I would have done different," said Oosthuizen.
"But I think there probably isn't much I would have done different. I felt like I gave it my all, didn't throw anything away, played the best I probably could have coming down the stretch in a major and I was outplayed.
"Being that close to the green jacket is tough to get over it immediately but I think time will heal it and it just gives me a bit more confidence when I put it on eventually that I will be over it."
The 29-year-old will be competing in Malaysia later this week.