The two Midwesterners -- Johnson is from Cedar Rapids, Iowa, while Stricker hails from Madison, Wisconsin -- go out of their way to say there's no rivalry. And Johnson gives the nod of supremacy to Stricker.
"I've won once. He's won three times," Johnson said. "I don't think it's a debate. Twenty-five years from now, nobody is going to remember who finished second, third or fourth."
Stricker kidded, "I thought I was the man here," adding he felt playing at TPC Deere Run was something of a home weekend, even though Madison is three hours away.
"We don't have a tournament in Milwaukee anymore, and this is the closest thing to home, I guess," Stricker said. "It looks like we could be playing this in Madison."
Stricker's 65 gave him 133 on the par-71 course, tied with Rory Sabbatini, Ryan Moore and Todd Hamilton.
Johnson shot 4-under 67 in the afternoon despite two bogeys in his last four holes. That dropped him into a tie with McGirt.
McGirt, 35, is looking for his first PGA Tour victory. He added a 66 to his opening 64, but like Johnson, he finished with a bogey. McGirt's best finish this year is a tie for sixth in the Northern Trust Open at Riviera. Since then, he's had one top 10 and has missed the cut in seven of 14 tournaments.
McGirt is winless on the PGA Tour in 111 starts, most of them in the last four years. His best finishes are a pair of ties for second in the Canadian Open, in 2012 and 2013.