Both of Georgia’s U.S. Senate seats had elections on November 3. In special elections, there are no party nominees, and so for the short term, it was already obvious that there would be a run-off in January, because each major party had multiple candidates, so no one came close to 50% of the vote.
But the other seat, the regular term, is a standard election with party nominees. The Republican, Democratic, and Libertarian Parties had nominees on the November ballot. As more ballots have been counted in Georgia, it is apparent that no one got 50% in that race either. The Libertarian Party nominee is getting 2.4%, and although Republican incumbent David Perdue is leading, he is slightly under 50%.
It is somewhat likely that without the two Georgia Senate races decided until January, no one will know until January which party will hold control of the U.S. Senate.