LAS VEGAS — Andrew Putnam birdied two of the last three holes Friday for a 6-under 65 and a share of the second-round lead with Russell Knox in the Shriners Hospitals for Children Open.

Putnam is played his fourth PGA Tour event. He earned his tour card this year through the Web.com Tour.

Knox, from Scotland, had a 67 to match Putnam at 10-under 132 at TPC Summerlin.

Knox had six birdies and two bogeys — on Nos. 2 and 3 — in the second round.

Andrew Svoboda and Tony Finau were a stroke back. Finau shot 65, and Svoboda had a 67.

Defending champion Webb Simpson topped the group at 8 under after a 65. Martin Laird, the 2009 winner who was tied with Stewart Cink for the first-round lead, was in the group at 8 under after a 70.

He had a double bogey on the par-4 seventh — his 16th hole of the day.

Spencer Levin, George McNeill, Ben Martin, Bo Van Pelt, Scott Piercy and Wes Roach also were 8t under. Levin and McNeill shot 63 — the best rounds of the week.

Cink followed his opening 64 with a 75 to drop into a tie for 45th at 3 under. He had a quadruple bogey on the par-4 11th — his second hole of day.

Jarrod Lyle had a 71 to fall into a tie for 22nd at 5 under. The Australian is making his second PGA Tour start since a recurrence of leukemia some 18 months ago.

FedEx Cup winner Billy Horschel missed the cut with rounds of 71 and 72. At No. 13, he was the top-ranked player in the field.