South Carolina, US (BBN)-Donald Trump has won the South Carolina primary in the Republican race for president, cementing his status as the man to beat for his party's nomination.
In the Democratic contest, Hillary Clinton beat Vermont Senator Bernie Sanders in a tight race in Nevada, reports BBC.
Both results will be key ahead of the "Super Tuesday" round on 1 March, when a dozen more states make their choice.
Republican senators Ted Cruz and Marco Rubio are currently locked in a battle for second place in the state.
But the Trump victory claimed a major scalp when former Florida Governor Jeb Bush dropped out of the race after finishing a distant fourth.
Days earlier, he had enlisted his brother, former President George W Bush, to make a rare political appearance and boost his flagging campaign.
"There's nothing easy about running for president," Trump said at his victory rally in Spartanburg on Saturday evening. "It's tough, it's nasty, it's mean, it's vicious. It's beautiful - when you win it's beautiful."
His supporters erupted in a roar at his campaign headquarters when the projected results were announced.
The New York billionaire's campaign has been dogged in controversy, with his latest spat with the Pope on Christian values hitting the headlines this week.
Cruz and Trump won the first two states - the Texas conservative firebrand victorious in Iowa and businessman Mr Trump winning in New Hampshire.
But all eyes will now be on Florida Senator Marco Rubio, who the Republican mainstream core will likely look to as their leading candidate now that Jeb Bush has backed out of the race.
"This country is ready for a new generation of conservative to lead this country into the 21st century,'' Rubio said after the poll results came out.
Hillary Clinton, who won Iowa but was beaten convincingly in New Hampshire by Sanders, declared victory earlier in Nevada in a tweet saying "this is your win".
"Some may have doubted us, but we never doubted each other," Clinton told supporters at a victory rally in Las Vegas. "This is your campaign."
The presidential race between Hillary Clinton and Bernie Sanders has grown increasingly close in recent weeks, with the former secretary of state expected to win Nevada in double digits just weeks ago.
But the Vermont senator, who has successfully galvanised young voters with his calls for free university education, appears to have performed better than expected with Hispanics in Nevada.
According to NBC exit polls, Mr Sanders won among Hispanics with 53 per cent of the vote but lost among black voters earning just 22 per cent of their vote.
Clinton's next test will be in the Democrats' South Carolina primary on 27 February.
Republicans will hold their own caucuses in Nevada on Tuesday.
Once each state has voted in the primaries or caucuses, the delegates won by each party candidate will go on to endorse them at party conventions in July.
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