Hillary Clinton and Donald Trump battled it out at the University of Nevada for the final time before Americans go to the polls on November 8.
Here's everything you missed while you were asleep:
Trump didn't guarantee that he'd accept the election result
When moderator Chris Wallace asked Trump directly if he would accept the election result, he replied: "I will tell you at the time. I'll keep you in suspense."
Clinton described his remarks as "horrifying", while the Republican National Committee said the national party would "respect the will of the people".
Clinton accused Trump of calling everything rigged when things don't go his way
"Every time Donald thinks things are not going in his direction, he claims whatever it is is rigged against him," she said.
"There was even a time when he didn't get an Emmy for his TV programme three years in a row and he started tweeting the Emmys were rigged against him."
Trump branded the sexual assault claims against him false and accused Clinton's campaign of being behind them
"I didn't even apologise to my wife who is sitting right here because I didn't even do anything," he said. "These women ... I think they either want fame or her campaign did it. And I think it's her campaign."
Clinton responded: "Donald thinks belittling women makes him bigger. He goes after their dignity and self-worth."
They both talked about Vladimir Putin
Clinton branded Trump a "puppet" of the Russian president and challenged him to condemn Russia's suspected involvement in the hacking of emails during the election campaign.
He said he didn't know Putin, adding: "He said nice things about me. If we got along well, that would be good.
"He has no respect for her. He has no respect for our president."
Then things got super childish. Clinton responded: "That's because he'd rather have a puppet as president of the United States" and Trump replied: "No, you're the puppet."
Trump called Clinton 'a nasty woman'
To compliment the bitter tone of the last two debates, Trump branded his rival a "nasty woman" and claimed America would be in "some mess" if she is elected.
"The only thing you have over me is experience, but it's bad experience," he added.
Trump wants to keep out 'bad hombres'
When the talk turned to immigration, Trump discussed his desire to build a wall on the US-Mexico border.
He said: "One of my first acts will be to get all of the drug lords - we have some bad, bad people in this country that have to go out ... We have some bad hombres here and we are going to get them out."
The two clashed over abortion rights
Trump said he planned to appoint "pro-life judges" to the Supreme Court and allow individual states to determine whether abortion should be legal.
Referring to Clinton, he said: "Based on what she's saying ... you can take the baby and rip the baby out of the womb in the ninth month, on the final day, and that's unacceptable."
Clinton responded: "That's not what happens in these cases and just using that kind of scare rhetoric is just terribly unfortunate."