Neil Johnson of River Falls fired a 2-under par 70 to take a 4-shot lead at the halfway mark of the Wisconsin State Open at Blackwolf Run in Kohler.
Johnson holds a 4-shot lead on Tyler Obermueller, who won the State Amateur last month.
First-round leader and defending champion Ryan Helminen of Appleton, struggled with a 77 in round two. He drops into a tie for third with Brian Brodell and Daniel Woltman. Mario Tiziani is another shot back and six shots off the lead.
The State Open wraps up with a 36-hole final today.