Venezuela's opposition leader vowed on Sunday, March 10 to fight late Hugo Chavez's preferred successor for the presidency next month and the pair quickly locked horns in an angry war of words, Reuters said.

Henrique Capriles, a 40-year-old state governor, will face election favorite and acting President Nicolas Maduro. The pair must register their candidacies for the April 14 vote on Monday.

The election will decide whether Chavez's self-styled socialist and nationalist revolution will live on in the country with the world's largest proven oil reserves.

"I am going to fight," Capriles said at a news conference. "Nicolas, I am not going to give you a free pass. You will have to beat me with votes."

Former Vice President Maduro, 50, a husky one-time bus driver and union leader turned politician who echoes Chavez's anti-imperialist rhetoric, is expected to win comfortably, according to two recent polls.

Maduro pushed for a snap election to cash in on a wave of empathy triggered by Chavez's death Tuesday at age 58 after a two-year battle with cancer. He was sworn in as acting president on Friday to the fury of Capriles.

Capriles, the centrist Miranda state governor who often wears a baseball cap and tennis shoes, lost to Chavez in October. But he won 44 percent of the vote - the strongest showing by the opposition against Chavez.