Davidson bested Enoch in 2018 with 66.58 percent of the vote.
According to unofficial election results, the incumbent Davidson, R-Troy, hauled in 91.5% of the votes, also making it one of the first races of the night to be called by the Associated Press.
Davidson will face Vanessa Enoch of West Chester Twp., who defeated Matt Guyette of Greenville for the Democratic slot in November.
MORE: Check out the area’s 2020 primary election results
Enoch produced a large 79.7% to 20.3% victory over Guyette.
The district consists of all of Butler, Clark, Darke, Miami and Preble counties, and the southernmost portion of Mercer County.
1st Congressional District
Two Democrats squared off in today’s primary to face incumbent U.S. Rep. Steve Chabot, R-Cincinnati, who ran unopposed in the Republican primary.
Democrats, Nikki Foster of Mason and Kate Schroder of Cincinnati, both want to unseat Chabot in November.
Schroder with 55 percent of 13,514 votes is leading Foster who has 45 percent.
RELATED: Butler County voter turnout barely tops 18 percent
Libertarian Kevin David Kahn of Cincinnati was also on the primary ballot unopposed.
The district includes all of Warren County and western Hamilton County.
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