LAKE BUENA VISTA, Fla. -- Henrik Stenson has yet to make a birdie on Saturday during the third round of the Children's Miracle Network Hospitals Classic.

Even so, the Swede has broken out of a three-way tie for the lead and now is alone at the top of the leaderboard at 12 under. His playing partners, Justin Leonard and Bio Kim, have both dropped one shot to par and trail by one.

James Driscoll, who entered the week ranked No. 125 on the money list, has joined the group at 11 under after making birdie on three of his first four holes.

Luke Donald, who must finish in a two-way tie for second or better to have a chance to win the money title, is headed in the right direction early Saturday. He made a 5-footer for birdie at the third hole to move to 8 under and into a tie for 11th.

The man Donald is trying to unseat, Webb Simpson, started off with a 12-footer for birdie on No. 1. But he missed a 6-footer for par at the fourth hole and couldn't get up and down from left of the green at the par-3 sixth so Simpson is now tied for 28th at 6 under.

By Helen Ross, PGATOUR.COM

LAKE BUENA VISTA, Fla. -- For most people, their 21st birthday requires a big celebration.

Bio Kim's big day came Aug. 21 and the youngest player on the PGA TOUR was at his parents’ home in Seoul, South Korea. He wasn't in the mood to party very much, though.

"I actually had surgery over my month break," Kim said, referring to his layoff during the PGA TOUR Playoffs for the FedExCup. "I didn't really have a lot of fun at that point."

Kim, who holds a share of the lead at the Children's Miracle Network Hospitals Classic after shooting 65 on the Magnolia Course, has had a heart problem since he was a little boy. He wasn't sure exactly of what the diagnosis would be in English but it revolves around an irregular heartbeat.

Kim, who is 12 under at the midway point at Disney, said an incision was made in his thigh and the doctors actually were able to correct three problems in his heart. He was in the hospital for three days and didn't touch a club for a week.

"(I was scared) because it's not like an arm or a leg," Kim acknowledged. "It's the heart. I was a little bit scared but this is the second time getting the surgery. I had it when I was 11 so it was all right. I didn't quite get used to it but a little bit better."

Kim said he almost passed out during the second round of The Greenbrier Classic earlier this year. He landed in the hospital that day and the doctors advised him to have the surgery.

"I thought it was okay; the doctors were 'you shouldn't really keep playing right now,'" said Kim, who shot 70 that day and made the cut. "So it was good that I got a little surgery this year."

Kim came to Disney ranked 168th on the money list. So he needs a big week in order to keep his card. If he doesn't, he'll head back to q-school.

"I'm not afraid of q-school because I'm only 21 and I've got a lot of things to do and a lot of tournaments to do," Kim said. "... If I'm lucky enough to keep my card this week, it will be great. Hopefully I can play better next week -- no, next year."

LAKE BUENA VISTA, Fla. – The hot hand in the afternoon wave is an unlikely one – Jeff Maggert.

The 47-year-old has made just five cuts in 17 starts this year on TOUR, most recently in early May at the Zurich Classic. But you wouldn’t know it from his play Friday on the Magnolia Course, where he’s 5 under through 10 holes (he started on No. 10) and 8 under for the tournament.

Justin Leonard and Bio Kim continue to lead at 12 under after shooting 63 and 65 in the morning and are the only players at double-digits under par.

In the afternoon’s marquee matchup, Webb Simpson is turning the tables a bit on Luke Donald. Donald, hoping to overtake Simpson atop the money list, played better by two shots Thursday but is 1 over on his second round with all pars and one bogey through eight holes. Simpson is 2 under for his round and has overtaken Donald on the leaderboard.

With the wind down from Saturday and conditions ideal for scoring, a few players are taking advantage and making a big move up the leaderboard.

The biggest of those moves is coming from Brandt Snedeker, who is 5 under through his first seven holes and suddenly finds himself one shot of the lead as the final pairing gets set to tee off.

Like everyone else in contention this week, Snedeker has torn up the front nine at Harbour Town, where he’s a collective 12 under on the front side so far.

Snedeker isn’t the only one going low, though. Kevin Na just capped a 5-under 66 and earlier in the day the PGA TOUR’s youngest player, 20-year-old Bio Kim, carded a career-best 65.