Due to a rain delay Thursday at Laurel Valley Golf Club, the first round was completed on Friday. Eventually, darkness forced the suspension of second-round play.
Mediate was one of only 74 players to complete 36 holes. Steve Flesch also stands at 7-under through 10 holes of his second round.
Steve Elkington and Nick Price are each tied at 6-under-par through 10 and seven holes, respectively.
Price led after opening in 66 Thursday. The 44-year-old Zimbabwean, winless on the PGA Tour since 1998, recorded one birdie and one bogey on Friday.
Mediate, who grew up about 20 miles away and joined the Laurel Valley Club six years ago, played 29 holes on Friday.
The Greensburg native offset a pair of bogeys in the second round with four birdies and an eagle.
Im extremely comfortable here, said Mediate, who is staying at his parents house this week. That doesnt get the job done most of the time, but it certainly helps.
Arnold Palmer, who brought the tour back to the Keystone State last year, also played 29 holes Friday, but did so primarily as a marker.
Playing with a sore back, Palmer declined to turn in a scorecard after the first round. He asked the sign holder to stop posting his score in relation to par. The 72-year-old would have shot 90 at the course he founded.
Yet instead of quitting, The King continued to play alongside Vijay Singh and Loren Roberts ' much to the delight of about 1,000 fans following him.
I know a lot of the people came out to see me play, and thats a lot of the reason why I played, said Palmer, who agreed to enter the event only after the tour created an extra spot in the field, because he didnt want to take the place of a younger player.
Many also came out to support Mediate ' and he didnt disappoint.
The four-time PGA Tour winner nearly holed a 9-iron at the par-4 2nd, and then nailed a 25-foot eagle putt at the par-5 6th.
I was a bit nervous yesterday, teeing off, being at home in front of everybody, Mediate said. I can tell the people are pulling for me.
Full-field scores from the Marconi Pennsylvania Classic