Republicans are on the cusp of winning the Senate majority after netting five seats overall and defeating two Democratic incumbents in Colorado and Arkansas.

The GOP needs to gain six seats to take the majority, and the party has pickup opportunities on the board in Iowa, Alaska and Virginia, where Sen. Mark WarnerMark Robert WarnerTrump official releases unverified Russian intel on Clinton previously rejected by Senate panel FBI director casts doubt on concerns over mail-in voting fraud Democrats call for declassifying election threats after briefing by Trump officials MORE (D) is narrowly ahead of Republican Ed Gillespie in a suprisingly tight race.

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Republicans have already picked up open seats in West Virginia, South Dakota and Montana, and they held on to a seat in Georgia, with David Perdue defeating surging Democrat Michelle Nunn without having to go to a January runoff. 

Vulnerable Kansas Sen. Pat RobertsCharles (Pat) Patrick RobertsThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill GOP senators say coronavirus deal dead until after election MORE (R) also held on, beating back a vigorous challenge from Independent Greg Orman. 

Several late-closing states will prove crucial. Alaska Sen. Mark BegichMark Peter BegichAlaska group backing independent candidate appears linked to Democrats Sullivan wins Alaska Senate GOP primary Alaska political mess has legislators divided over meeting place MORE (D) is seeking to hold off Republican Dan Sullivan, and it’s possible a close result in the sparsely populated state will lead to a recount or a very late call well into Wednesday. 

Arkansas Sen. Mark PryorMark Lunsford PryorCoronavirus poses risks for Trump in 2020 Tom Cotton's only Democratic rival quits race in Arkansas Medicaid rollback looms for GOP senators in 2020 MORE (D) was the first incumbent to fall on Tuesday. Freshman Rep. Tom CottonTom Bryant CottonGOP senators confident Trump pick to be confirmed by November Sunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (R) handily defeated the centrist lawmaker in a state that has slipped rapidly away from Democrats in recent years.

Colorado Rep. Cory GardnerCory Scott GardnerSenate Democrats want to avoid Kavanaugh 2.0 Breaking the Chinese space addiction Trump dumbfounds GOP with latest unforced error MORE (R) also knocked off Sen. Mark UdallMark Emery UdallThe 10 Senate seats most likely to flip Democratic presidential race comes into sharp focus Democrats will win back the Senate majority in 2020, all thanks to President Trump MORE (D), defying Democratic cries that their vaunted ground game would save the vulnerable incumbent. 

Republicans also picked up a Democrat-held open seat in West Virginia with Rep. Shelley Moore CapitoShelley Wellons Moore CapitoCongress must finish work on popular conservation bill before time runs out Second GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure MORE's (R) easy victory. 

South Dakota flipped to the GOP column after former Gov. Mike Rounds (R) won the open seat of retiring Democratic Sen. Tim JohnsonTimothy (Tim) Peter JohnsonCornell to launch new bipartisan publication led by former Rep. Steve Israel Trump faces tough path to Fannie Mae, Freddie Mac overhaul Several hurt when truck runs into minimum wage protesters in Michigan MORE (D). The three-way race had become a late headache for the GOP with the addition of former GOP Sen. Larry Pressler (I), but with Republican attention and help the race turned again in its favor. 

Rep. Steve Daines (R) then won the open Democratic-held seat in Montana. 

With the early victories, Republicans are on the brink of their goal of Senate control. 

Sen. Mitch McConnellAddison (Mitch) Mitchell McConnellIn rare move, Schumer forces vote to consider health care bill amid Supreme Court tensions COVID-19 talks hit crucial stretch Supreme Court nominee gives no clues in GOP meeting MORE (R-Ky.) was declared the victor in his closely watched race as soon as polls closed in the Bluegrass State, defeating Democrat Alison Lundergan Grimes to earn a sixth term. Democrats had early hopes for the Kentucky secretary of State's candidacy, but her campaign couldn't take advantage of the senator's unpopularity in the state. 

McConnell might have to wait a bit longer to see whether he can add Senate majority leader to his title, however. 

A victor in the fight for the Senate majority may not be named until early Wednesday morning — or perhaps not even until December though. In Louisiana, there will be a runoff in December between Sen. Mary LandrieuMary Loretta LandrieuBottom line A decade of making a difference: Senate Caucus on Foster Youth Congress needs to work to combat the poverty, abuse and neglect issues that children face MORE (D) and Rep. Bill Cassidy (R). Cassidy is seen to have an edge in the GOP-leaning state.  

There was good news for Democrats early on Tuesday too. Polls closed in North Carolina at 7:30 p.m., where Sen. Kay HaganKay Ruthven HaganThe Hill's Campaign Report: Democratic Unity Taskforce unveils party platform recommendations Democrats awash with cash in battle for Senate The Hill's Campaign Report: Trump's job approval erodes among groups that powered his 2016 victory MORE (D) was clinging to a narrow lead over Republican state Speaker Thom Tillis.

In New Hampshire, Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenNew Hampshire poll finds Biden up 8 points over Trump Senate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen MORE (D) was able to hold the seat from challenger former Massachusetts Sen. Scott Brown (R), though the Republicans was refusing to concede late Tuesday as the race had tightened after the networks initially called the race for the incumbent. 

— Updated at 11:07 p.m.