British Open champion Louis Oosthuizen blamed a "stupid" shot for dropping one off the lead with a round to go at the European Tour’s Nordea Scandinavian Masters.
Oosthuizen, trying to become the first player ever to follow a Claret Jug victory with another European Tour win a week later, was tied with Swede Richard Johnson and Korean KJ Choi when he pulled his approach to the last into sand.
Splashing out to 18 feet and missing the putt dropped the 27-year-old South African to 9 under par and it means Johnson and Choi go head-to-head in the final group again on Sunday.
Johnson matched Oosthuizen's 2-under 70, while halfway leader Choi managed only a 71 after experiencing what he called "all four seasons in one day."
It was windy, it was wet and for one stroke it was very cold too for the 40-year-old, whose only European success was the 2003 German Masters.
Choi hit his second to the long 13th into the edge of the lake and chose to take his shoes and socks off and wade in to try to splash the ball out. He went over the green with it before salvaging his par, but found himself in a three-way tie when Johnson and Oosthuizen birdied the 622-yard 15th and he missed from five feet.
"It was a bit disappointing,” Oosthuizen said after his closing 5. “I made two thinking errors on the course and it cost me two bogeys."
The first led to a three-putt 6 on the long ninth. He also drove into the water at the 13th, but after taking a penalty drop he hit his third to 15 feet and made the putt for one of four birdies.
"I was a bit gutted after the ninth and on the last it was a stupid second to that pin,” he said. "I've got my goals set on winning again, though, and it will be right up there to me -- a great achievement after winning last week."
Johnson has a friend -- a local restauranteur, radio host and someone he describes as "kind of a comedian" -- acting as his caddie this week. His regular in the States, where the 33-year-old is based, is Lance Ten Broeck, but he is playing in the Senior British Open at Carnoustie this week.
Johnson, like Choi, has one European title to his name, but that was eight years ago in Australia.
"I decided to play here about three weeks ago," he said. "I heard Canada (the PGA Tour’s RBC Canadian Open, beig played this week in Toronto) was such a great course, but it kind of worked out to come here.
"It's very exciting because the crowd is really behind me. I was not nervous at all and I'm really looking forward to tomorrow,” he added. "The wind was blowing really, really hard and I was not driving it great. I had to rely on my short game and it came through again."
New Zealander Mark Brown, with a best-of-the-day 67, and Argentina's Rafa Echenique (72) are tied for fourth on 7 under, while Italian Edoardo Molinari, who could force himself into the all-important top nine on the European Ryder Cup table with a top-2 finish, is one further back.