Australian Rod Pampling is three shots adrift of leader Hunter Mahan at the halfway mark of the AT&T National on Friday. Pampling fired off a four-under-par second round of 67, which included six birdies and two bogeys, to move to equal fifth and four under overall. His countrymen Marc Leishman (two under) and Jason Day (one under) are tied for 11th and 15th spot respectively while Adam Scott (even) and Greg Chalmers (one over) have their work cut out for themselves. Robert Allenby (seven over) and Nick O&aposHern (17 over) missed the cut. Mahan carded a superb six-under 65 to take a two-shot lead over the rest of the field at the Congressional Country Club. The American produced the equal lowest round of the tournament so far to move into seven under. In sweltering conditions, Mahan holed seven birdies and a bogey to be the best of just 18 players under par. Zimbabwean Brendon de Jonge (69) and American pair Jimmy Walker (69) and Robert Garrigus (67) are tied for second at five under. Tiger Woods, winner of the PGA Tour tournament in 2009, moved into contention with his three-under 68 taking him to two under at the halfway mark. Meanwhile, Gregory Bourdy moved one shot clear at the top of the leaderboard following the second round of the Irish Open. Bourdy had shared the first-round lead with Indian Jeev Milkha Singh, and a five-under-par 67 on Friday was enough to see the Frenchman reach 12-under overall for the European Tour event. Singh meanwhile could only manage a one-under 71 at Royal Portrush Golf Club, County Antrim, to drop back to tied eighth. England&aposs Mark Foster matched Bourdy&aposs 67 to end the day outright second at 11 under. Italian Lorenzo Gagli, Ireland&aposs Padraig Harrington and Englishman Paul Waring hold a share of third place at 10 under after all three impressed on Friday. Australian Matthew Zions is five shots off the pace in equal 10th spot on seven under while compatriots Brett Rumford (one under), Andrew Dodt (one over) and Richard Green (three over) all missed the cut.