Published Saturday, 08 September 2012
Rory McIlroy waves to the gallery on the 18th green. (© Getty)
The Holywood golfer is tied with US duo Tiger Woods and Ryan Moore a stroke off the pace going into the weekend at Crooked Stick in Carmel, Indiana.
McIlroy, fresh from his victory at the Deutsche Bank Championship in Norton on Monday, kept himself in contention with a topsy-turvy 68 to finish -12.
He hit six birdies in his second round and eagled the par-three ninth, but four bogeys cost the USPGA champion top spot.
Woods finished with a flourish as he notched up three birdies in his final four holes.
Meanwhile seven birdies helped Singh advance to 13 under on Friday as he chases his first PGA Tour win in four years.
England's Lee Westwood and Indiana-born Bo Van Pelt are two shots adrift of Singh after rounds of 65 and 69, respectively.