Mark Wilson fired a 10-under par 62 Friday to join Ben Crane and David Toms atop the leaderboard after two rounds at the US PGA Tour's Humana Challenge, where low scores tumbled in. Wilson had eight birdies and an eagle in a flawless round at the Palmer Private course, one of three par-72 layouts in use for the $5.6 million event. Crane carded a 63 on the Palmer course and Toms shot a 65 on the Nicklaus Private course as the leaders finished 36 holes on 16-under 128. They were three shots ahead of Colombia's Camilo Villegas, Harris English, Chris Kirk and Bobby Gates, who shared fourth on 131. English also posted a 62, with his round coming on the Nicklaus layout. Villegas carded a 68 while Kirk and Gates both shot 63. Wilson admitted that when he eagled the par-five 11th to get to eight-under for the day, the thought of reaching golf's magic number of 59 crossed his mind. “I don't know why the conversation went there ... but I thought about it,” said Wilson, who made two more birdies on the way home, the last of which came when he sank an eight-foot putt at the last for his share of the lead. Low scores are nothing new for this tournament, formerly known as the Bob Hope Classic. The Nicklaus and Palmer courses at the PGA West resort ranked as two of the three least difficult layouts on the US tour last season. David Duval fired a 59 on the Palmer course 13 years ago with four 61s being recorded in 2009 and there have been 14 rounds of 62 in the past four years. Ryan Moore tied the Nicklaus record with a 61, and still found himself five shots adrift. Moore's round matched South Korean Charlie Wi's score on the Nicklaus, set in 2009. World No. 8 Dustin Johnson, however, couldn't take advantage. He withdrew after the first nine holes of his second round complaining of back pain. Johnson carded a 72 Thursday, the first time he had walked 18 holes since arthroscopic surgery on his right knee in November. Grace, Colsaerts share lead In George, South Africa, Branden Grace of South Africa and Nicolas Colsaerts of Belgium had contrasting third rounds in wet and windy conditions to share the lead at the Volvo Golf Champions Saturday. Grace made two double bogeys on his back nine to shoot a 2-over 75 and join Colsaerts (69) on 10-under 209. South African pair Retief Goosen (70) and Charl Schwartzel (68) are a stroke back. The wind and intermittent rain made for a difficult day. It took its toll on Spain's Pablo Martin. The three-time European Tour winner shot a 90 to sit last on 20 over. “The conditions were really toEuropean Ryder Cup captain Jose Maria Olazabal maintained his good form with a 72 and an 8-under 211 total going into Sunday's final round.
