Days after this year's midterm election, a number of key contests remained undecided by midday Friday, sending both parties into overtime and to the courts as they try to influence the counting of outstanding ballots.

Critical Senate races in Florida and Arizona, Georgia's high-profile governor's race, and nearly a dozen House races remain too close to call, according to NBC News projections, while a Senate race in Mississippi is headed to a runoff election later this month.

Here are the remaining uncalled races as of Friday. This list will be updated.

Senate and gubernatorial races

Arizona Senate: Newly counted votes have given Democrat Rep. Kyrsten Sinema a narrow lead over Republican Rep. Martha McSally, who led on Election Night. The two are separated by fewer than 10,000 votes — just a half a percentage point — as a judge agreed to hear a GOP lawsuit to limit the vote in the state's most populous counties. As many as 500,000 ballots remain uncounted and officials in Maricopa County, which includes Phoenix, said it could take most of next week to process outstanding ballots there.

Florida Senate: Florida is once again home to bitter partisan election drama with both parties pursuing litigation over various electoral administration issues as Republican Gov. Rick Scott hurls unsubstantiated allegations of voter fraud, while his opponent, Democratic incumbent Sen. Bill Nelson eyes a recount, as mandated by state law.