Niagara Gazette —
Koepka led the trio with a 2-over 72, while Mickelson tied Boss at 76.
Mickelson hit the shot of the day, a left-handed chip with a right-handed 9-iron that holed on No. 13.
After sending his second shot on the par-5 into the trees along the right, he blasted an iron over the green that rolled up close to the base of a sapling. Out of options, Mickelson — a righty — decided to attempt a left-handed chip with a righty club.
His chip flew low but caught the top of a small hill on the back of the green and popped up slightly into the air. It hit the edge of the green and pinned itself between the flag and the inside of the hole, and it dropped when Mickelson pulled the pin.
The irony of a lefty Mickelson hitting an unconventional shot wasn't lost on him.
"I was just trying to find a way to make par or even bogey to be honest," he said. "And to be able to make a shot left-handed from 30 or 40 yards out was pretty cool."
The 17-year veteran, playing in his ninth Porter Cup, said the course was playing at a PGA level.
"The course is playing a lot more like it did in the late 90s, early 2000s," he said. "There's a little more rough, and the biggest thing is that the greens are much better this year than they've been the last couple years. They roll very smooth. The speed right now is actually a speed where you can definitely make puts.
"... The last couple years (there) wasn't much rough. It's nice to come back and play with some rough. It's sort of more like a PGA Championship-type course."Follow Gazette sports reporter Mike Meiler on Twitter @mikemeiler for updates on your local teams.