Second-round viewer's guide
The basics: Tee times | TV | Course | History

Five feature pairings
8 a.m. (10th tee): Hank Kuehne, Jay Haas, Jesper Parnevik
Kuehne and Haas both shot even-par 70s in hot, tough conditions late in the day Thursday, but will play their second rounds early Friday morning, when Oak Hill's defenses will be down. If they can post a low number early -- as Phil Mickelson and Rodney Pampling did Thursday -- they could be in great position for the weekend.

12:35 p.m. (First tee): Rodney Pampling, Geoff Ogilvy, Ron A. Philo Jr.
Pampling's 66 on Thursday came in his first-ever PGA Championship round, but he'll be hard-pressed for an encore. If you remember, Pampling led after the first round of the British Open at Carnoustie in 1999, but missed the cut after shooting a horrid 86 in the second round.

1:25 p.m. (First tee): Phil Mickelson, Kenny Perry, Thomas Bjorn
With Bjorn and Perry playing so well prior to this week, Mickelson flew in under the radar in this group. He won't have that luxury Friday, as he thoroughly thrashed his playing partners in the first round (Perry and Bjorn were a combined 13-over). At 4-under, Mickelson holds at least a share of a first-round lead for the first time since the 2002 Players Championship. The bad news? He's led 12 events after Thursday play (including two majors) in his career and has won only one of them (1995 Northern Telecom Open). And in the seven events he's led after the first round since 1997, his second-round score has been an average of almost six strokes worse.

1:55 p.m. (10th tee): Mike Weir, Jim Furyk, Ben Curtis
Thursday was a day for lefties to go low, as Weir joined Mickelson near the top of the leaderboard. Weir missed just two fairways, so he didn't have to deal as much with the thick rough. He's controlling the ball well off the tee and could be in this thing for the long haul. Furyk finished 2-over, but his round fell apart late with bogeys on 15, 17 and 18. He'll have to play those holes on his front nine Friday. Curtis had all kinds of trouble starting off, bogeying his first four holes and five of his first seven. He was even-par the rest of the way but is likely too far back to be a factor at 5-over.

2:05 p.m. (First tee): Tiger Woods, Rich Beem, David Toms
Whodathunk this threesome would combine to shoot 21-over on Thursday? Woods is the only one who still has a realistic chance of getting himself back into contention, but he's also perilously close to the cut line (58th). Tiger is eight shots back, but playing from behind is something he's used to doing in the 2003 majors. He has been at least five strokes out of the lead after the first rounds of The Masters, U.S. Open and British Open. He needs to straighten it out off the tee on Friday, as he found just five of 14 fairways in the first round, which led to hitting just seven of 18 greens.

Also watch for ...
A stronger Oak: The Friday forecast calls for more hot, steamy weather, which means an Oak Hill course that played relatively soft Thursday will dry out in the sun and breeze, making it much harder for players to keep it on the greens and in the fairway off the tee. "As the sun (bakes the course) and a little bit of breeze (kicks up), the greens will start to firm up and dry up, the pin placements will get more difficult ... and putting will be more difficult," Weir said. "That's just the evolution of a golf course during a major championship." Players who failed to go low on Thursday missed a big opportunity, Oak Hill will only get tougher on Friday and through the weekend.

David Lefort is ESPN.com's golf editor, and can be reached at david.m.lefort@espn3.com.