Wisconsin native Jerry Kelly and Brett Quigley each shot 3-under 67 Friday to move to 7-under-par 133. They share second place with Patrick Sheehan, who posted a 5-under 65.
The second round was completed despite a 98-minute rain delay that quickly flooded the course. Most of the delay was actually due to cleanup after torrential rain fell for about 15 minutes.
Blake started on the front side at Brown Deer Park Golf Course. He began quickly with a birdie at the first. Blake notched two more birdies on the front side at the sixth and ninth.
Around the turn, he struggled to a bogey at No. 10. He atoned for that error two holes later as he birdied the par-4 12th. Blake cruised to the house with five straight pars, but three-putted for bogey at the last which dropped his lead to one shot.
'The winds were blowing the ball all over the place,' said Blake, who completed his round before the rain came. 'It was a little frustrating to end the round that way after playing pretty solid all day long.'
Kelly used a stroke of luck during the rain delay to help his round. He approached tour officials during the delay to notify them that his putter-head had come loose. Officials allowed him to change putters for the remainder of the round. Lucky for him, Kelly had accidently left a spare putter in his car, otherwise he would have been in real trouble.
'I don't know what happened,' said Kelly of his first putter. 'I'm walking to the practice greens getting ready to practice and the next thing I know the thing is turning in my hands. I was going to take the second one out of my bag when I got to Madison. I forgot and it ends up coming with me to Milwaukee. That was pure luck right there.'
Kelly rolled in two birdies on the front side before dropping a shot at the eighth. Around the turn, he used the new putter to birdie the 11th and 14th to grab a share of second. He is looking to become the first Wisconsin native to win this tournament.
'I really didn't think I was going to putt well. It didn't look good,' Kelly said. 'But I've been stroking so well this week, I've got such good rhythm and good technique right now that all I had to do was set that thing right where I wanted it to.'
Quigley moved up the leaderboard with four birdies and two bogeys on the front nine. On the back side, his birdie at No. 15 moved him into a share second.
Sheehan began the day four shots off the pace. He posted three birdies and one bogey on the back side, his first nine. On the front side, he ran off three consecutive birdies from the sixth to climb the leaderboard.
Heath Slocum fired the round of the day with a 7-under 63 to move to 5-under-par 135 after two rounds. He is tied for fifth place with Loren Roberts, Joey Sindelar, Tommy Armour III, Joel Edwards, Stephen Allan and Shigeki Maruyama.
The cut line fell at 2-over-par 142 with 81 surviving to play on the weekend.
Jeff Sluman, the 2002 champion, struggled to rounds of 72-76 to miss the cut at 8-over-par 148.