Jordan Spieth wants to "throw away" his poor finish to the third round at the Masters after taking a one-stroke overnight lead at Augusta.
The American world number two appeared set for a commanding advantage in his title defence, only to drop a shot at the 17th hole and double bogey the last on Saturday.
At three under, Spieth is nevertheless a shot ahead of Smylie Kaufman and two clear of Bernhard Langer and Hideki Matsuyama, with Jason Day among those three back.
The two-time major winner, looking to become only the fourth player after Jack Nicklaus, Nick Faldo and Tiger Woods to retain the Masters, is desperate to put his dreadful finish to the third round behind him.
"I've just got to absolutely throw this away. I've got to throw away the finish to this round," Spieth told CBS.
"[I need to] just pretend tomorrow [Sunday] is a new round and everyone is tied and you've got to shoot the best score to win.
"[Also], understand that this is the position I wanted to be in after 54 holes and not think about the finish to today's round."
Spieth said he was eyeing three pars to finish his round, but "just got really wayward with the ball" from there.
The 22-year-old had earlier responded to a double bogey at the 11th with birdies at 12, 14 and 15 to take control of the Masters.
"It was nice. There was a nice putt on 12 to hole and a great putt on 13 before making the ones on 14, 15. We were rolling at that point," Spieth said.
"I really shouldn't [have] hit driver on 17 in the position I was in. I should've hit a three wood, make sure I at least have a chance to hit that green. I live and learn."
Despite his late collapse on Saturday, Spieth has now led the Masters for a record seven rounds in a row and will be the favourite to secure another green jacket on Sunday.