Renacci took 52 percent of the vote to Sutton's 48 percent, with 93 percent of Ohio's 16th District reporting.
The race was one of the nation's most expensive House races, with outside groups spending nearly $10 million on the race to air thousands of attack ads.
Republicans attempted to paint Sutton as a lockstep liberal, a label Sutton did little to temper, as she stood by potentially problematic Democratic policies like healthcare reform and higher taxes on the wealthy.
Renacci ran in the direct opposition, opposing all tax increases and pledging to repeal the Affordable Care Act. And it seems that, in a district redrawn to be slightly more favorable to the Republican, Renacci's hardline positions paid off.