AUGUSTA, Ga. -- From his spot in the middle of the 14th fairway, Peter Hanson stood and allowed the roar to wash over him.
Behind him, Phil Mickelson had ignited his supporters with an eagle on No. 13 after plodding around the front side. Hanson was familiar with the roars, having played with Mickelson the first two rounds at Augusta National Golf Club.
And he fed off them Saturday, sticking his wedge to 2 feet for birdie on the 14th, following with a birdie at No. 15 and closing with birdies on the final two holes to sleep on the lead at 9-under par and a one-shot advantage over Mickelson entering the final round of only his second Masters.
Hanson shot 31 coming in. Mickelson blitzed the back nine in 30. Hanson's 65 Saturday is the low round of the tournament. Mickelson, who made birdie on 18 for the third consecutive day, shot 66.
The pair will play together again in the final group Easter Sunday, one vying for his first major title, the other looking for a fourth green jacket.
"The crowds are so much behind Phil and they love him, and I understand why, the way he plays," Hanson said. "I'm just going to try to enjoy it. Like I said, I tried to stay pretty close to him the first couple of days and let it feed off a little bit. It's great playing in front of his fans. It's just an amazing feeling."
South African Louis Oosthuizen is two shots back, 7 under after a bogey at the last. Bubba Watson (-6), Matt Kuchar (-5) and four players at 4 under chase the final group.
Hanson declared Mickelson the overwhelming favorite.
The two faced off in the 2010 Ryder Cup singles matches. Mickelson started with four consecutive birdies and defeated Ryder Cup rookie Hanson 4 and 2. That event's star power impressed Hanson, who sounded like a fan when describing what it was like to rub shoulders with Rory McIlroy, Lee Westwood and, of course, Mickelson.
On Saturday, he watched with the rest of the spectators behind the 15th green when Mickelson, playing from a spot Hanson had been moments earlier, ballooned a flop shot within birdie range to match him at 7 under. Hanson had played a conventional, less risky bump-and-run.
"He's got a few shots around the green that I'm not even close to," Hanson said. "But I've just got to try to play my game and try to work around this golf course the best I can."
Mickelson managed his round early, playing away from unfavorable pins on the front side in hopes of sneaking in a long putt. Instead, he made nine pars but quickly reached red numbers with a birdie on the difficult par-4 10th.
He added a birdie at the par-3 12th before the show at 13. His 6-iron approach nestled 25 feet left of the flag, and the uphill, hard-right breaker elicited the roar Hanson heard ahead on No. 14.
Mickelson wowed again with the flop shot from behind No. 15, using a 64-degree wedge with little bounce to slide under the ball. And on the 18th, his 7-iron from 198 yards rolled inside 20 feet for another birdie and three celebratory fist pumps.
Mickelson said he was trying to keep pace with Hanson in the group ahead.
"It's very difficult to try to follow those kind of birdies when you're watching it right in front of you," Mickelson said. "And I was fortunate to get a couple there to stay within one."
Mickelson and Oosthuizen are the major championship winners among the top five on the leaderboard. Hanson's best finish at a major came at the 2011 U.S. Open, when he contended for second place during McIlroy's runaway victory before settling for a tie for seventh.
Hanson, who moved to Orlando, Fla., from Sweden nearly three years ago, said he favors a U.S. Open-type setup, with tougher conditions and lower scoring. And through the first two rounds at Augusta National, he liked that the red numbers didn't dive too low.
He said he surprised himself by firing the tournament's low round.
"I think this golf course is unbelievably challenging," he said. "Like I said, to shoot 65 around here -- I've been watching this tournament since I was a young kid, and seeing Freddie Couples and the guys go and shoot 30 and 31 on the back nine is something you just dream about."