Neither party can lock the majority until January runoffs in Georgia.
Incumbent Alaska GOP Sen. Dan Sullivan defeated Al Gross, an independent running as a Democrat.
The outcome was never in doubt, but legacy media “decision desks” left the race — and the state’s outcome in the presidential contest — in “pending” status as if there was a possibility Democrat candidates could pull the races out.
If Joe Biden ultimately wins, Republicans are still short of the 51 seats they need for majority control.
They have a 50-48 hold on the Senate with the Alaska win, but two races in Georgia are heading to a Jan. 5 runoff.
In the Senate race in North Carolina, Democratic challenger Cal Cunningham has conceded to Republican Sen. Thom Tillis.
With Biden, the path to keeping Senate control is more difficult for Republicans.
The vice president of the party in power, which on Jan. 20 will be Kamala Harris, is the tie-breaker.
That means if Republicans only have 50 seats, Democrats control the Senate.
Republicans would need 51 senators to overcome that.
The Georgia runoff elections, set for Jan. 5, are swiftly becoming a showdown over control of the chamber.
The state is closely divided, with Democrats making gains on Republicans, fueled by a surge of new voters.
But no Democrat has been elected senator in some 20 years.
GOP Sen. Kelly Loeffler will face Rafael Warnock, a Black pastor from the church where Rev. Martin Luther King, Jr. preached.
And Republican Sen. David Perdue, a top Trump ally, will face Democratic challenger Jon Ossoff.
Adapted from reporting by Associated Press.