If Belmonte wins, she will be the third female vice mayor next to Charito Planas and Connie Angeles.

Defensor was the former Quezon City 3rd District Representative, then he became the chairman of the Housing and Urban Development Coordinate Council, Secretary of the Department of Environment and Natural Resources and Presidential Chief of Staff.

His running mate is actress and three term 2nd District Councilor Aiko Melendez of the Pwersa ng Masang Pilipino.

Other candidates for the mayorship are 4th District councilor Ariel Inton, Jay Bautista, John Charles Chang, Engracio Icasiano, Henry Samonte and Roberto Sombillo.

Crisologo filed a case in the Metropolitan Trial Court of Quezon City for the exclusion of candidate Vivienne Tan from the voter's list of the district, on the grounds that she was not a Filipino citizen when she registered as a voter, and she failed to meet the residency requirements under the law.

Tan appealed and won in the Regional Trial Court (RTC), but Crisologo appealed to the Court of Appeals, which disqualified Tan as "Not being a Filipino citizen at the time of her application to be registered as a voter on October 26, 2009 or at the time when her said application was approved by the [Commission on Elections] on November 16, 2009, Tan's inclusion in the voter’s list of Precinct 0853-A, Barangay Santo Domingo, Quezon City, is therefore, highly irregular and downright invalid."

Further, Immigration Commissioner Marcelino Libanan certified that Tan re-acquired her Filipino citizenship only on December 1.

Tan registered as a voter on October 26, 2009, before taking her Oath of Allegiance to the Republic of the Philippines on November 40, 2009.

Under Philippine law, to be able to run for Congress, a candidate is required, among others, to be a natural born citizen of the Philippines, a registered voter in the district in which he or she shall be elected, and a resident thereof for a period of not less than one year immediately preceding the day of the election.