Mayor Joseph A. Curtatone received more than 75 percent of the vote and Suzanne Bremer beat out fellow challenger Richard J. Scirocco to narrow the field of mayoral candidates to two after Tuesday’s primary.

Curtatone easily outdistanced his two grassroots challengers and came away with a commanding victory on primary day. He received 4,652 votes to Bremer’s 822 and Scirocco’s 464, garnering 76.7 percent of the total vote, according to unofficial poll results.

Curtatone said the wide margin of victory is proof voters are satisfied with his performance and the direction he is taking the city in.

“I’m thrilled with 76 percent of the vote. It’s a statement by the voters who have seen me work hard for four years. I have no intention of slowing down. The voters endorsed my performance and have given me a mandate,” he said. “And now I will keep working for the city.”

Curtatone must now defeat Bremer in the Nov. 6 general election to win a third term in City Hall. Bremer said she first entered the race for mayor after the campaign tactics used by Alderman-at-Large John M. Connolly in his special election victory this year against Marty Martinez, who Bremer had volunteered for. She said Connolly’s mailings in the last week of the campaign were negative and played on voters fears.

A librarian at Tufts University and first-time candidate, Bremer promises an open, inclusive city government focused on cultivating affordable housing and open space if elected. Despite being a heavy underdog against Curtatone, at the outset she claimed her chances of unseating him were “phenomenal.” And after a primary day performance that keeps her alive as a mayoral hopeful for another five weeks, Bremer is still optimistic.

“I came in as an underdog and I’m still an underdog. In the end it will be up to the voters to decide what they want,” she said. “All I can do is work harder and harder.”

Tuesday’s big loser was Richard J. Scirocco. With 464 votes, he failed to qualify for the general election. He blamed media coverage of his past brushes with the law for his loss. He said he had “a better knowledge and understanding of the city than Suzanne Bremer” and should have been the one nominated to challenge Curtatone.

However, controversy and accusations marked much of Scirocco‚Äôs campaign. The Boston Herald reported his history of violence against women and long list of run-ins with the law — four women had sought and received restraining orders against him and he was once arrested for allegedly providing alcohol to minors, though the alcohol charges were later dismissed.

And Lenny DiCicco, a close friend of Scirocco’s, added more controversy when he told a Curtatone supporter to switch sides because “we’re going to bury [Curtatone].” The Curtatone backer told police and a police officer on paid detail accompanied the mayor the next day. The one day detail reportedly cost the city $1,034. DiCicco said the remark was not a threat but a verbal jab twisted by people with political motives.

“If the papers had given me a chance and not gone through with a smear campaign against my name, maybe people could have had a different perspective of me and I would have prevailed. I’m not a bad person, at least I don’t think I am. The media is completely the reason I lost,” he said.

On the day of the primary, Scirocco was seen driving around the city in the passenger seat of a limousine with his campaign posters on the windows. A woman speaking through a bullhorn exclaimed from another car covered in “Scirocco for Mayor” signs, “Vote for change, vote for Scirocco.”

In the only other primary Tuesday, Charles Chisholm easily beat out Robert Adams for the right to challenge incumbent Ward 6 Alderman Rebekah L. Gewirtz in November. In the ward‚Äôs three precincts, Gewirtz received 727 votes to Chisholm’s 389 and Robert Adams’ 47.

Gewirtz was facing two challengers after her first term in office since defeating Connolly, a 22-year incumbent, in 2005. Chisholm and Adams both pulled papers to run against her, forcing Tuesday’s primary.