Not even having the claret jug in his possession for a year changed that.
The South African had to return golf's oldest prize to the Royal & Ancient in advance of his title defense at Royal St. George's. Unlike some past champions, there were no wild tales about where it had been or what kind of drinks he poured from the jug.
The most treasured moment involved his roots.
Oosthuizen, the son of farmers along the Garden Route in South Africa, grew up playing at tiny Albertinia Golf Club, a nine-hole course with greens made of sand and oil. After his seven-shot victory, he took the trophy there to show his friends.
"That was the most special thing for me, having the claret jug there at a golf club that's probably got 42, 43 members, which are basically field farmers and a few guys in town," he said. "And that's where I grew up. That was quite a special moment for me."
As for giving the trophy back?
Much like the sensation Graeme McDowell felt when he returned to defend his title at the U.S. Open, it was a mixture of sadness and relief. Oosthuizen spent a year under the burden of being an Open champion, yet he wouldn't mind keeping the jug around.
"I think it's a great honor," he said. "But from here on out, you're not the Open champion anymore. Well, unless ..."
Oosthuizen didn't arrive on the southeastern coast of England in the best form.
He started the year by winning the Africa Open, but that was about it. Oosthuizen missed the cut in some of the biggest events — the Masters, The Players Championship and the BMW PGA Championship — before he tied for ninth in the U.S. Open. But if he thought his golf was headed in the right direction, he flew over to Illinois last week for the John Deere Classic and missed another cut.
Then again, he wasn't playing all that great when he arrived at St. Andrews last year.
But he found something in this swing during the practice rounds, found his rhythm, got a good break with the weather and wound up with largest margin of victory in the Open since Woods won by eight shots in 2000.
"I probably didn't feel that confident last year going into the Open, but after the first round, I knew the game was there," Oosthuizen said. "It was just a matter of keeping everything together."
The landscape is much different now, and not just because of a surface that reminds so many players of being on the moon with so many humps and hollows on a links course where the ball can bounce just about anywhere.
The star of golf is no longer Woods, or any American, for that matter. It's all about 22-year-old Rory McIlroy, coming off his eight-shot win in the U.S. Open. Then there's Luke Donald, who won by four shots Sunday in the Scottish Open to cement his spot atop the world ranking.
Oosthuizen is more than just another name in the field.
For one thing, British fans hold a special place in their hearts for the Open champion, not matter their fame or form. Besides, how can anyone ever forget a name like Oosthuizen. Not only did it take longer than most to engrave on the claret jug, even after all his success, it's one name in golf that people have trouble pronouncing.
"It's not an easy surname," he said. "It's probably more annoying when they say, 'I've been practice it for a month,' and they still get it wrong. No, no, it's fine. I know it's not the easiest surname."
And then there was the announcer at Riviera for the Northern Trust Open. He went to great care to pronounce the name correctly, going over it several times until he had it just right. And he pronounced it correctly. But at the last second, the starter noticed the "RSA" next to his name to denote the Republic of South Africa.
"Louis Oosthuizen," the starter said. "From Russia."
No matter how it gets pronounced, it is spelled correctly on the base of that silver claret jug. And even though Oosthuizen had to return the trophy this week, he will always be an Open champion.
And even though he doesn't look for fanfare, he enjoyed his notoriety.
"I don't know if "enjoying" is the right word," he said. "I think it's just how you handle it. If you're going to play well, you're eventually going to be in the spotlight, and it's part of the package. I don't mind it, but it's not a thing that you go out and find. I just take it as it comes, and if I do well and I'm in for it, then it's just another thing I need to be ready for."