uke Donald is trying to pick himself up and fight for his world number one spot in the final round of The Masters at Augusta.
A third-round 75 - all the more disappointing because he had pitched in for eagle on the third hole - had left Donald down in 52nd place and 16 strokes behind surprise leader Peter Hanson.
"There is nothing worse than waking up on Sunday knowing that whatever you do it is not going to be good enough," said the 34-year-old, although that ignored his battle to stay atop the world rankings.
Donald, playing his 35th major and yet to win one, was battling to stay ahead of Rory McIlroy and Lee Westwood at the top of the rankings, and their Saturday struggles had at least improved his chances of extending his second reign.
If Donald climbed to 40th position, McIlroy had to finish in the top 20 to become number one again after his 77 saw him slump from joint third to 27th.
Westwood had rallied for a 72 to be in a tie for sixth, five adrift of Hanson, but he had to win just to have a chance of regaining top spot.
Driving into a bunker on the long second obviously did not help Donald's cause, but his pitch caught a ridge exactly as he planned and rolled back down to seven feet.
He made the birdie putt and remained one under for the round after six holes.
Hanson's brilliant 65, the low round of the week, had given himself the chance to become the first Swede to win a major, but he had three-time champion Phil Mickelson right on his heels and South Africa's Louis Oosthuizen was only two back in third.
As for Tiger Woods, he teed off again in 38th on three over and needed to move up 17 places just to avoid it being his worst Masters as a professional.