A standout third round by Australian Marc Leishman has seen him join compatriot James Nitties four shots off the lead going into the final round of the HP Byron Nelson Championship. The Aussie duo are both on nine-under in equal ninth position and trail leaders Rory Sabbatini and John Mallinger who are tied together on 13-under-par. A seven-under 63 saw Leishman card the best round on day three, as he rocketed up from equal 36th at the halfway point of the tournament into contention with one round to play. Leishman, who started on the 10th tee, recorded three birdies from his first three holes and despite bogeying No.13 and 14, he rallied to register another six birdies to finish strongly. Nitties on the other hand could only manage a two-under 70 which saw him slip from his second-round position of equal third. Nitties reeled off six birdies, but bogeys at the 3rd, 7th, 10th and 15th holes proved costly. Meanwhile, Sabbatini and Mallinger ended the day as they started it. After beginning the third round out in front on eight-under, both shot five-under rounds of 65 at TPC Four Seasons to move two shots ahead of a group of three players. DA Points, who also carded a 65, was joined on 11-under by Dustin Johnson and England&aposs Brian Davis, who both signed for 66s. It could have been better for Johnson who racked up six birdies in his first eight holes to go out in 30 only to come home in 36. Kevin Streelman is three off the pace after a 64 and tied at 10-under with Glen Day and Briny Baird. John Senden and Robert Allenby are both on six-under in equal 23rd spot. Lower down the leaderboard, England&aposs Greg Owen and Scotland&aposs Martin Laird both shot 68s to sit three under. Elsewhere, at the BMW PGA Championship, Paul Casey goes into the final round with a three-shot lead over Dane Soren Kjeldsen. Casey, who has already won on the European Tour in Abu Dhabi earlier this year and recently recorded his first US PGA Tour victory in the Houston Open, will move to third in the world behind Tiger Woods and Phil Mickelson should he win the 750,000-pound ($AU 1,532,300) first prize. Colin Montgomerie, earlier in the day, looked likely to be one of the players who would chase Casey all the way but he faded badly at the end of his third-round 69, posting three bogeys in four holes on the back nine. Third Round of the HP Byron Nelson Championship -13: Rory Sabbatini 68 64 65, John Mallinger 67 65 65 -11: D A Points 68 66 65, Dustin Johnson 68 65 66, Brian Davis 68 65 66 -10: Kevin Streelman 67 69 64, Glen Day 69 66 65, Briny Baird 69 64 67 -9: Marc Leishman (Australia) 68 70 63, James Nitties (Australia) 65 68 68 -8: Charley Hoffman 71 66 65, Jeff Maggert 71 66 65, Bryce Molder 68 68 66, George McNeill 69 67 66, Fred Couples 69 66 67, James Driscoll 67 66 69 -7: Michael Letzig 68 68 67, Scott McCarron 66 69 68, Charles Howell III 66 69 68, Charlie Wi 73 66 64, Nicholas Thompson 73 66 64 Also: -6: John Senden (Australia) 71 68 65, Robert Allenby (Australia) 67 67 70 -5: Danny Lee (New Zealand) 69 67 69, Nathan Green (Australia) 70 69 66 -4: Tim Wilkinson (New Zealand) 69 67 70, Greg Chalmers (Australia) 68 69 69 -2: Rod Pampling (Australia) 72 67 69 Third Round of the BMW PGA Championship -13: Paul Casey 69 67 67 -10: Soren Kjeldsen 69 69 68 -9: Rory McIlroy 72 70 65 -8: Ross Fisher 68 73 67, Charl Schwartzel 68 72 68 -7: Stephen Dodd 71 68 70, Thomas Levet 70 71 68, Marc Warren 72 66 71 -6: Anthony Wall 67 71 72 -5: Nick Dougherty 73 71 67, Simon Dyson 74 69 68, Colin Montgomerie 69 73 69 -4: Ben Curtis 69 70 73, David Horsey 67 71 74, Miguel Angel Jimenez 68 70 74, Martin Kaymer 72 70 70, Alexander Noren 69 71 72 Also: -2: Marcus Fraser (Australia) 71 73 70, Richard Green (Australia) 72 74 68 E: Brett Rumford (Australia) 71 73 72 +3: Peter O Malley (Australia) 74 72 73