Paul S. Pavlus has gained the lead Tuesday with 10,757 votes, or about 46 percent, in the Republican primary to fill the Pietrucha vacancy in Cook County's 13th judicial subcircuit.
Republican Martin C. Kelley ran unopposed for a second vacancy in the 13th subcircuit.
Results are unofficial.
The 13th subcircuit includes parts of Arlington Heights, Barrington, Hoffman Estates, Palatine, Schaumburg and Streamwood.
Also seeking the GOP nod were Ketki "Kay" Steffen, Nicholas G. Grapsas and Peter A. Pacione.