BMW Championship: Paul Casey three shots behind leader Dustin Johnson
|BMW Championship, third-round leaderboard (US unless stated)|
|-18 Johnson; -15 Casey (Eng); -14 Holmes; -12 Castro, -11 Scott (Aus), Kuchar; -10 Palmer; -9 Kirk|
|Selected others: -7 Knox (Sco) -5 Day (Aus) -4 Donald (Eng) -3 McIlroy (NI), McDowell (NI)|
England's Paul Casey is second, three shots behind leader Dustin Johnson, after three rounds of the BMW Championship in Carmel, Indiana.
Casey, 39, shot a four-under-par 68 after birdies on the fifth, ninth, 15th and 16th to stay in contention for a potential first win of the season.
US Open champion Johnson is on 18 under overall, with Casey on 15 under.
Scotland's Russell Knox is tied 12th on seven under and England's Luke Donald is two shots further back in tied 26th.
Northern Ireland's Rory McIlroy and Graeme McDowell both shot rounds of one over to drop 16 places to joint 35th on three under.
Johnson, the 2010 champion, had carded a course record nine-under-par 63 for the overnight lead on Friday and followed that with a 68, while Casey did not drop a shot in his round.
World number four Jordan Spieth shot an eagle on the 11th after holing a 60-yard chip from the rough but finished with back-to-back bogeys to lie eight-under.
It was a similar story for world number one Jason Day - the Australian saw bogeys on the 13th and 14th drop him to five-under after a round of 71.
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