Rose, who became the first English victor of the US Open for 43 years at Merion in 2013, carded a third round of 67 to finish six under par, with halfway joint leader Garcia shooting 70.
A green jacket would fit perfectly in Fowler's colorful wardrobe, and handicapper Wes Reynolds (@WesReynolds1) likes Fowler's chances to win after taking the popular 28-year-old at 20-1 odds before the tournament.
Rose did all of his work on the back nine, birdieing five of the last seven holes for an inward 31 and a 5-under 67, the best round of the day.
This is Rose's fifth time holding the lead at Augusta after a round. Pieters had the worst round of Friday's co-leaders, a 75 that puts him five shots off the pace. Spieth said, though he has made birdies on 13 by laying up, he had good memories of the favourite shot of his career, a second shot to the green on the 13th on Sunday on the way to his 2015 Masters win, and tried to repeat it on Saturday.
Rickie Fowler finished a shot back, while Jordan Spieth carded a 68 to move level with fellow Americans Charley Hoffman and Ryan Moore on four under.
His Masters finishes are tied for second, first and tied for second.
Spieth said he's merely grateful for the chance after his hard opening round that included a 9 on the par-5 15th hole. We all know what happened previous year as he fell apart late and effectively coughed up his second straight green jacket. "It offers you a run", he said. Hoffman has four holes remaining in his round.
Justin Rose charged from behind on the back nine at Augusta National. Aaron went on to claim his only green jacket.
Spieth said his Masters tournament so far has been representative of his year: "It's been slow starts, and just grind it out". If he had made a bogey instead of a quadruple-bogey 9 on the 15th Thursday, he would be leading by one stroke. Here are the facts: Spieth has competed in four Masters and been in one of the final two pairings each time.
Jordan Spieth is in title contention for a fourth consecutive year at the Masters. He is 8 under over the 39 holes since that brutal quad, with just one bogey over the final 33 of those. Now, Hoffman is looking to break away once more.
For the first time at Augusta, he will not play in the final group on Sunday, but most likely will be contender. He finished with a 75 and is five shots back at 1 under. Moore, who doesn't often contend in majors, finished Round 3 with six birdies and three bogeys.
With the flag tucked in the back right of the 16th green, Hoffman sent one soaring off to the left.
Justin Rose and Sergio Garcia led the US Masters on six under par and Jordan Spieth was lurking two shots back after an absorbing third round at a sun-drenched Augusta National on Saturday. I'm right-handed. I could see the right edge of the tower, but my ball - the actual shot wasn't blocked. He led for the majority of the round, but a double-bogey on the 16th, pushed him down the leaderboard.
There is a three-way tie for fourth on -4. Pieters, a Masters rookie, and Fowler teed off first, then Hoffman and Garcia followed.
Fowler floundered early, standing 1 over for the day through the 10th.
In about five hours, there could be more clarity or simply more chaos at Augusta National.
At the Masters, Spieth has recent memories of both.
World number two McIlroy's hopes of becoming only the sixth man to win all four majors at his third time of trying at Augusta look ever slim.
It certainly fired up Mickelson, who opened with birdies on the first and second holes to move to 2-under as those watching applauded wildly. He had only two under-par rounds on 13 Saturdays and was a cumulative 38-over. Mickelson shot a 74 and will start the final round trailing by eight.
Rickie Fowler leads the chasing pack on -5.
It could be another bad Day. He was the first to tee off in Saturday's third round and quickly found problems again with a bogey on the par-5 second. His 67 was the best round of the day. His short game had the answer for the only hiccups, with deft chips to set up his birdies at Nos. That won't change in today's round, although the temperatures will be higher.
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