Windy conditions made consistent play tough at the Lake Malaren Golf Club as indicated by Guthrie's round of five birdies and four bogeys. He's at 8-under 136 for the tournament.
Six players are tied for second at 4-under. They include Richard Gonzalez, whose 18th-hole bogey was the only blemish on a 5-under 67, and Scott Jamison, who also bogeyed 18 in shooting 68. Paul Casey, Simon Dyson, Thongchai Jaidee and Craig Lee all turned in second-round 70s for their share of second.
John Daly, who has in second after a 68 Thursday, was 2-over 74 Friday and dropped to a tie for ninth while Peter Uihlein, who started the day in third, had a 75 and is tied for 19th, eight strokes behind Guthrie.
Guthrie opened the second round with a birdie at the first hole and had his first bogey of the tournament at the fifth hole. A birdie at 7 allowed him to make the turn at 1-under.
His second nine was a mixed bag of bogeys at Nos. 10, 12 and 18, birdies at 11, 15 and 17 and three pars.