No choice in 36% of legislative races. (Urban Milwaukee, 6/14/2018)
Original 6/5/2018 post, "17 Democratic and 4 Republican incumbents running unopposed in state legislature races", starts here.
Source: Wisconsin Elections Commission
Very likely to be 5 Republicans.
Watertown police investigate allegations candidate forged signatures on nomination papers. (Milwaukee Journal Sentinel, 6/5/2018)