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Casey: two shots back
English trio Ian Poulter, Paul Casey and Luke Donald are hot on the heels of the leaders at the halfway stage of the BMW Championship at Cog Hill.
Korean Carlie Wi shot a second round 69 to join first round leader Matt Kuchar (72) at the top of the leaderboard at six-under-par, while Australian Marc Leishman is a shot further back.
But the Englishmen are just two shots off the pace in a group that also includes South African Retief Goosen and American Dustin Johnson.
Poulter would have shared the lead but for two late bogeys in his 72, while Donald - joint second in the Deutsche Bank Championship on Monday - birdied the last for a 70 that maintains his bid for the £6.5million jackpot in Atlanta in two weeks' time. Casey had a second successive 69.
All three Englishmen look certain to qualify for the 30-man Tour Championship at East Lake.
Kuchar, winner of the opening play-off event, is still in the driving seat, though, after it initially looked as if illness was going to cost him dear.
The American Ryder Cup newcomer, suffering from a virus, bogeyed four of his first six holes, but played the last seven in three under to be alongside Wi.
Justin Rose had a 71 for three under and joint ninth.
Tiger Woods remains well off the pace after he improved only one shot on his opening 73, the same as Londoner Brian Davis, while Rory McIlroy remains near the rear of the 70-strong field after rounds of 76 and 74.
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