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At the top: Jason Dufner set an Oak Hill East Course record of 7-under-par 63, tying the low round ever recorded in 153 years of major championship play, to take a two-shot lead. He’s at 9-under 131 through two rounds.

In the hunt: Three players find themselves two shots back, first-round co-leaders Adam Scott and Jim Furyk, along with Matt Kuchar, who’s bogey on the par-4 18th was his only one of the championship thus far.

Outside looking in: Notable players missing the cut of 3-over 143 were major winners Bubba Watson, Ernie Els, Padraig Harrington and Charl Schwartzel, along with former world No. 1 Luke Donald.

By the numbers: The scoring average is 71.88 through two rounds. In comparison, it was 74.31 for four rounds in 2003, the last time the PGA was at Oak Hill. The easiest hole Friday was the par-4 14th, at a stroke average of 3.857, while the 509-yard par-4 17th was the most difficult, playing to an average of 4.481 shots.

No repeat: Shaun Micheel, who won here in ’03, will not be around for the weekend. Micheel missed the cut after shooting consecutive rounds of 76.

Biggest move: K.J. Choi bounced back from a first-round 76 to shoot 5-under 65. That moved him up 94 places, from 132nd to a tie for 38th. Choi made six birdies and one bogey Friday.

Shot of the day: Dufner, who lost out on the 2011 PGA Championship in a playoff against Keegan Bradley, holed out from the fairway for an eagle on the par-4 second hole, hitting a sand wedge from 105 yards out.

Quotable: “I’m going to have to put together a really good weekend. This golf course is pretty soft. It’s definitely gettable.” – World No. 1 Tiger Woods, who is 10 shots back after a round of even-par 70 Friday.

– Jay Skurski