Canada's Stephen Ames tied for 1st entering final round of Principal Charity Classic

Tim Herron shot a 7-under 65 on Saturday and is tied for the lead with Steve Stricker and Canadian Stephen Ames after two rounds of the Principal Charity Classic at Des Moines, Iowa.

The Vancouver resident Ames shot his second consecutive 66 while first-round leader Stricker shot 68, four shots off his opening pace at the Wakonda Club.

Tim Petrovic is alone in fourth after a 65 put him two shots behind the trio of leaders.

WATCH | Ames impresses in 2nd round:

Herron had an eagle on the par-5, No. 8, six birdies and one bogey during his stellar round.

The 53-year-old battles Dupuytren's contracture, a hand disorder in which there is a gradual tightening of tissue-like cords under the skin. Eventually, the fingers move in toward the palm.

"I've been struggling a lot with my hands and my feet and I think the heat's kind of helped a little bit," Herron said after Saturday's round. "I still get some stingers and no feeling in my right hand, but I'm just trying to play as much golf as I can before I feel like something's growing on my hands every day.

Herron said he will feel discomfort at times after hitting a ball.

"It's a shock feeling that goes all the way up your arm," said Herron, who is looking for his first Champions win.

Stricker is looking for his third consecutive win. He won the Regions Tradition in Birmingham, Ala., in mid-May and the KitchenAid Senior PGA Championship last weekend in Frisco, Texas.

Stricker, 56, had four birdies during a bogey-free round. Three of the birdies came during his first five holes before his play wasn't as sharp.

"I let a couple get away at times, didn't really get it in the fairway all that well today," Stricker said. "One of those rounds where it kind of was a bit of a struggle,