Rory McIlroy doesn't need fans to keep his head in the game at the BMW Championship. Olympia Fields is so tough it won't allow anything but his full attention on every shot. McIlroy and Patrick Cantlay made their share of mistakes on Friday and shrugged them off because that's bound to happen on the toughest test the PGA Tour has seen this year. By the end of another steamy afternoon south of Chicago, they were the sole survivors to par. One week after McIlroy admitted to going through the motions without spectators around to provide the cheers, he had a 1-under 69 to share the 36-hole lead with Cantlay. It was plenty tough for Tiger Woods, whose PGA Tour season appears to be two rounds from being over. He didn't have enough good shots to atone for his bad ones, and he had to make a 35-foot par putt on his final hole to shoot 75, leaving him nine shots behind. Woods was toward the bottom of the pack at a tournament where he needs to finish around fourth to be among the top 30 who advance to the Tour Championship.