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Novak Djokovic's quest to regain his world number one ranking began with a battling three-set victory over Dominic Thiem at the ATP World Tour Finals in London Sunday.

Over the past decade, doctors have suspected that celecoxib, a pain-relieving nonsteroidal anti-inflammatory drug, or NSAID, increases heart risks more than older NSAIDs. But a new study, published Sunday in the New England Journal of Medicine, lays those fears to rest.

Leon Russell, who emerged as a rock 'n' roll star in the 1970s after working behind the scenes as a session pianist for other musicians, died Sunday in Nashville, his wife Janet Bridges told CNN. He was 74.

Donald Trump campaign manager Kellyanne Conway says the President-elect is considering calling a "special session" of Congress on the day he's sworn in to repeal President Barack Obama's health care law.

Dan Barkalow did not think twice before stopping by the side of the road near Freehold, New Jersey, to help out a stranded fellow biker.

Donald Trump's victory as President-elect has proven that America is not one nation, but two. These two Americas are deeply divided by mistrust and misunderstanding. One America is rejoicing, while another grieves in disbelief.

House Speaker Paul Ryan said Sunday despite Donald Trump's campaign rhetoric, lawmakers are not prepared to form a deportation force to round-up and deport undocumented immigrants.

President-elect Donald Trump is continuing his battle with one of the country's biggest news outlets, the New York Times.

Donald Trump's attorneys want the upcoming trial on Trump University postponed until after his swearing-in.

Famed musician Leon Russell died in his sleep at his Nashville home, according to family. He was 74 years old.

The Bataclan, the music venue where 90 concertgoers were killed in last year's Paris terror attacks, reopened Saturday with a performance from Sting.

Rudy Giuliani denied Sunday Russian officials' claims they'd been in touch with Donald Trump's campaign, saying he's aware of no such conversations.

Trump adviser Rudy Giuliani tells Jake Tapper that Trump's Muslim ban has changed and explains details of terror state ban

Perhaps the phenomenon might be better described as a cultural reaction to change, but it often expresses itself simply as hostility to people who are different, and usually brown and black. Consider, for example, that 72 percent of registered Republican voters still doubt that Barack Obama was born in the United States, according to an August NBC News poll.

Documentary filmmaker Michael Moore weighs in on President-elect Trump's visit to the White House.

Ethics experts say Trump's plan to reduce potential business conflicts doesn't go far enough to ensure that Trump's presidential duties don't clash with his money-making dealings.

Comedian Dave Chappelle wished Donald Trump luck and expressed his hopes that the White House would remain open to everyone.

Suddenly in line for the world's most important job, Donald Trump may look for lessons from the experiences of the presidents of his lifetime, writes Michael D'Antonio