CARMEL – Vijay Singh keeps giving himself chances to end four years without a PGA Tour victory. He made four birdies around the turn Friday for a 6-under 66 and a 131 total in the BMW Championship, putting his name atop the leader board for the second time in his last four tournaments.

It won’t get any easier the rest of the way.

Tiger Woods was one shot behind. So was Rory McIlroy. Going into a storm-filled weekend at Crooked Stick, four players who have reached No. 1 in the world were among the top six.

“I’ve got to keep it going,” Singh said. “I’ve been playing well for two days for a while now, but I need four days of good playing. Sooner or later, I think four days is going to happen. And hopefully, it starts this week.”

Woods started slowly and finished strong, with birdies on his last two holes for a 67. McIlroy, coming off what he called one of the best ball-striking rounds of his life, had to overcome four bogeys for a hard-earned 68. Joining them one shot out of the lead was Ryan Moore, who had a 66 and seems to play well in the BMW Championship no matter which state it is played.

Lee Westwood (65) and Indiana native Bo Van Pelt (69) were two shots off the lead.

Singh was at 13-under 131 on Crooked Stick, a Pete Dye course that is vulnerable to low scoring because of rain over the last several days.

“You come to a Pete Dye golf course, and you don’t expect to see 13-under par leading after two days,” Woods said.

He was happy just to be in the mix. For the second straight day, Woods wasn’t particularly sharp in any area of his game except for posting a score.

“I didn’t have it with my swing,” Woods said. “Just kind of fighting it around here. You look up at the scores, the guys are just running off. I just wanted to get to double digits (under par) today. I felt like that would have been a good accomplishment the way I was hitting the golf ball, and happy to get a couple of more.”

McIlroy’s mistakes all seemed to cost him, whether it was a three-putt bogey or bad lies when he missed the green. He was helped by a brilliant approach on the par-5 ninth to just inside 5 feet for eagle.

McIlroy and Woods are both going for a PGA Tour-leading fourth win of the year.

Singh would settle for just one win at this point. His last victory was the Deutsche Bank Championship in 2008, the year he won the opening two FedEx Cup playoff events and essentially clinched the $10 million bonus.

LPGA: In Williamsburg, Va., Jiyai Shin followed her opening 9-under 62 with a 68 to take a one-stroke lead in the Kingsmill Championship.

The South Korean player had four birdies and a bogey to finish two rounds at 12 under on Kingsmill’s River Course. She won the last of her eight LPGA Tour titles in November 2010.

American Danielle Kang was second after a 64.

Paula Creamer and Dewi Claire Schreefel were 10 under. Schreefel had a 66, and Creamer shot 67.

Former Fort Wayne resident Amanda Blumenherst shot a 75 and was at 7-over 149 to miss the cut.

EUROPE: In Hilversum, Netherlands, England’s Graeme Storm shot a 4-under 66 to take a three-stroke lead after the second round of the KLM Open. Storm had an 11-under total 129 total at Hilversumsche. He opened with a course-record 63.

Scotland’s Scott Jamieson (64), Spain’s Gonzalo Fernandez-Castano (65) and Sweden’s Peter Hanson (66) were tied for second.