(CNN) -- Colombian Camilo Villegas and American Mark Wilson are the halfway leaders at the Phoenix Open on 11-under par 140 at the TPC Scottsdale in Arizona.
Wilson raced through the back nine to a five-under-par 66 which drew him level with first round leader Villegas, who carded a 69.
Villegas blew his chance of the outright lead when he bogeyed the par-four 18th as he found a fairway bunker.
One stroke adrift were a trio of Americans in Ryan Moore, Rickie Fowler and Anthony Kim, who had six birdies on his outward nine, but had to settle for a 65 after making no further impression on the back nine.
England's Ian Poulter, who won last week's WGC-Accenture Match Play in such fine style, moved into contention with a seven-under-par 64 to be three strokes off the pace alongside compatriot Justin Rose.
Defending champion Kenny Perry conjured up four late birdies to make the cut on four-under, with two-time champion Phil Mickelson in the hunt after a second straight 68.
The unheralded Wilson admitted he is not a crowd pleaser but is happy to go unnoticed.
"I'm not a flashy player, my game is more like a Jim Furyk style, and I'll just go about my business," he told the official PGA Tour Web site.
Fellow leader Villegas said he had not been able to match his heroics of this first round 62.
"I wasn't as sharp as I was yesterday, but I still had fun. I still rolled some great putts that barely missed. I'm excited about tomorrow," he said.
"I still felt good. Yesterday I didn't miss a shot and yesterday every putt I hit seemed to roll in. "Today I just wasn't as sharp, I pushed a couple of drives and a couple of iron shots and that does it."
Villegas is also in fine form, having claimed third place behind Ian Poulter and Paul Casey in last week's WGC event.