Rory McIlroy lauded Jordan Spieth for scrambling his way through his third round at the Masters to maintain a slender advantage going into Sunday.
Spieth was far from his best from the tee on Saturday but his putter worked superbly to save him on a number of occasions, the leader picking up five birdies on his way round.
However, there were bogeys too - two of them - and two very costly double bogeys that left Spieth with a round of 73 as his lead remained at one shot.
McIlroy, who struggled alongside the defending champion, admitted Spieth's ability to turn a bad shot into a par or better had impressed him.
"I turned around after 15 and I thought 'how the hell is he [Spieth] two-under-par today?'," said the Northern Irishman.
"But it's his most impressive asset. As much as it could be annoying to his competitors, it's very, very impressive and I think the guys that are out there, that are playing that golf course today, we're the ones that appreciate that the most.
"As much as it does dishearten you seeing those putts lip in, you've got to take your hat off to him because he's such a grinder and such a battler and he always sticks in there.
"It's a tough finish [Spieth bogeyed 17 and double bogeyed 18] but he'll come out here and speak to you guys [media] and be positive and still be in the lead.
"He's sitting on top of the leaderboard where he has been for basically the last three years here. He's going out there tomorrow and it's his to lose and there are a few guys that have a chance.
"He's been in control of this golf tournament from the first day but I mean I haven't got a green jacket and he has. So there's added pressure that comes with that too."