A Democratic win in Tennessee would be the 4th-biggest special election flip in last 20 years 

Special elections for the U.S. House of Representatives in which a party flipped a seat that leaned toward the other party based on the last presidential election, 2005 to 2025

*Blanket primary or general election in which a major party had more than one candidate on the ballot.
†Election used ranked-choice voting.
Source: Almanac of American Politics, The Downballot, Greg Giroux, Polidata, State Election Sources