What to watch for going into Day 3 of the PGA Championship

KIAWAH ISLAND, S.C. — We've reached the halfway point of the 94th PGA Championship with a host of marquee names at, or near, the top of the leaderboard. Moving Day at a major is always full of intriguing storylines. With that in mind, here's a look at four you should keep track of during the third round.

Tiger Woods and Vijay Singh — It goes without saying that this is the pairing to watch on Saturday. Tied for the lead at 4-under, both players have a chance to make history this weekend -- Woods is going for his 15th major championship and Singh is trying to become the oldest major winner in golf history at 49 -- but keep an eye on how much they interact during the round. If you'll recall, Singh's caddie Paul Tesori wore a hat that had "Tiger Who?" taped to the back during the 2000 Presidents Cup. Woods went on to win the match, 2 and 1, but ever since that fateful day, the relationship between the two players has been, shall we say, chilly. Don't expect a lot of chitchat.

[Related: Blustery conditions at PGA fail to deter Vijay Singh]

The weather at the Ocean Course — One day after players battled 20-30 mph winds at the Ocean Course and the stroke averaged hovered around 78, players will once again want to keep one eye on the course and the other on the Doppler. With winds expected to top out at around 15 mph, we likely won't see a repeat of Friday's carnage. That doesn't mean players can go birdie hunting, but there's a good possibility we could see a few more rounds on the 60s today. Also, there's a 40 percent chance of thunderstorms today, which means an afternoon delay isn't out of the realm of possibility.

Phil Mickelson lurking on the weekend — Mickelson said after the first round that if he was within four shots of the lead going into the weekend, he liked his chances. Well, when he tees it up on Saturday at the PGA Championship, he'll be exactly four shots back of the leaders. He's not exactly playing at an incredibly high level -- he's been scrambling for his life to stay in the tournament -- but if he can continue to grind and hang around the front page of the leaderboard going into the final round ... you never know.

[Eric Adelson: Tiger Woods ends stellar Round 2 in disappointing fashion]

Tiger Woods' weekend struggles at the majors — Woods is tied for the 36-hole at a major for the second time this year, but the only thing that matters at this point is how he closes. The 14-time major winner has yet to post an under par round on the weekend at a major this year -- his last came during the final round of the 2011 Masters -- and that's a problem when you're trying to win your 15th major and inch closer to Jack Nicklaus' major record. He's looked solid through the first two rounds, but you could've said the same thing at the U.S. Open before he fell well off the pace. It's time to see if he can hold it together and keep the mistake to a minimum. He's never won coming from behind on Sunday at a major, so grabbing at least a one-shot lead is an absolute must.

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