Incumbent Democrat Susie Lee faces Republican Marty O'Donnell in Nevada’s 3rd District, a suburban Las Vegas seat with a D+1 to D+2 partisan lean that has produced margins under four points in the past two cycles. Lee secured renomination comfortably after primaries concluded in June, while O’Donnell emerged from a crowded Republican field. Forecasters rate the contest Lean Democratic, reflecting Lee’s incumbency and prior performance, yet the district’s swing character and national midterm environment keep outcomes uncertain. Trader pricing across margin buckets clusters around single-digit to low-double-digit Democratic leads, consistent with historical closeness and the absence of decisive late-cycle shifts in polling or endorsements that would separate the candidates. Upcoming debates and final fundraising reports could still influence the final spread before November 3.