Roru McIlroy and J.P. Fitzgerald
Rory McIlroy is on course for his first major championship after opening up a four-shot lead heading into the final round of the Masters, while Australian Jason Day sits in a four-way tie for second spot.
McIlroy carded a two-under-par 70 at the Augusta National Golf Club on Saturday to reach 12-under overall.
"It feels good - I'm in a great position," he said.
"I stayed really patient and I'm really happy with how I stuck to my game plans. It paid off in the end.
"I've been saying all week I feel comfortable and I'm posting good numbers."
Day held outright second going into the penultimate round, but an even-par 72 saw the Australian stay at eight-under.
Fellow Ausrealian Adam Scott made his move in the third round, shooting a five-under 67 to reach seven under and climb 14 places into equal sixth spot for the tournament.
Angel Cabrera, of Argentina, the 2009 Masters champion, matched Scott in shooting the joint-lowest round on Saturday, a five-under 67 that moves him alongside South African Charl Schwartzel (68), South Korean KJ Choi (71) and Day.
Tiger Woods had lurked ominously behind McIlroy, three shots back at the midway point of the tournament. But a two-over 74 on day three saw the 14-time major winner drop six places.
"I'm pleased with the way I played but I just made nothing," he said of his putting woes.
"I hit so many putts early that looked like going in and didn't, then I had a couple of three-putts (on 11 for bogey and 15 for par).
"That's not very good. Now I'm going to have to put together a good front nine and see what happens.
"I hit the ball well all day - that was not the problem. Take away the three-putts and give me a few, it could have been a pretty good round."
The four-time Masters champion is now five-under overall, tied for ninth place with Bubba Watson, 1992 winner Fred Couples, Australian Geoff Ogilvy and England's Ross Fisher.
With tougher pin positions and nerves taking their toll, scoring was higher than the first two days in Georgia, with McIlroy carding his second and third bogeys of the tournament at the fifth and 10th holes.
And with just one birdie having fallen at the par-three fourth, he spent much of Saturday over par.
But three birdies in the last eight holes - at 13, 15 and 17 - gave McIlroy a solid two-under card and a four-shot lead heading into Sunday's final round.
If he withstands the pressure over the final 18 holes, the 21-year-old will become the youngest man to don the green jacket since Woods' first major victory in 1997.
