Canada's Brooke Henderson tied for 4th after 2nd round at Women's PGA Championship

Canada's Brooke Henderson is tied for fourth at 4-under halfway through the Women's PGA Championship as In Gee Chun shot a 3-under 69 on Friday to increase her lead to six strokes. 

Henderson, of Smiths Falls, Ont., shot 69 on Friday to be among five players at four-under.

Chun led by five after the first round, equalling the biggest 18-hole advantage in the history of women's major championships.

"I really don't want to think about yesterday. It was almost a perfect game I had," said Chun, who is 11 under par through two rounds. "If I can think about yesterday, then I feel like I couldn't make good focus on my game today."

Lydia Ko (67) and Jennifer Kupcho (68) were second. Kupcho took the first major of the season in early April at the Chevron Championship and won a playoff Sunday in Michigan for her second LPGA Tour title.

Kupcho sounds comfortable having to chase down Chun.

"I think being behind and trying to catch up is better," she said. "I mean, I had the lead at Chevron by a few strokes, so I know how it feels to be in her position. Being behind is at least my preferred way."

Caroline Inglis (68) was another stroke back at 4 under, along with Henderson (69), Hannah Green (69), Sei Young Kim (69) and Jennifer Chang (70).

WATCH l Brooke Henderson posts solid 2nd round at women's PGA Championship:

After wet conditions for the first round brought the course's length into focus, it was a clear, warm day Friday, and Congressional was a bit more forgiving. Ko's impressive performance set the tone early on. Like Chun, Ko is trying for her third major title and first since 2016.

Chun began with three birdies in the first five holes. Then she missed the green on the par-3 seventh and took a bogey. On No. 8, a 245-yard par