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Conservative Argentine candidate wins first round of mayoral election in Buenos Aires

  • Surrounded by supporters, the current Mayor of Buenos Aires and presidential candidate Mauricio Macri celebrates at the end of mayoral elections in Buenos Aires, Argentina, Sunday, July 5, 2015. Buenos Aires will have a runoff election that would have the current Cabinet Chief of Buenos Aires and mayoral candidate Horacio Rodriguez Larreta competing against Martín Lousteau, candidate of the ECO coalition. (AP Photo/Daniel Jayo)

    Surrounded by supporters, the current Mayor of Buenos Aires and presidential candidate Mauricio Macri celebrates at the end of mayoral elections in Buenos Aires, Argentina, Sunday, July 5, 2015. Buenos Aires will have a runoff election that would have the current Cabinet Chief of Buenos Aires and mayoral candidate Horacio Rodriguez Larreta competing against Martín Lousteau, candidate of the ECO coalition. (AP Photo/Daniel Jayo)  (The Associated Press)

  • Carrying his daughter Antonia and surrounded by supporters, the current Mayor of Buenos Aires and presidential candidate Mauricio Macri celebrates at the end of mayoral elections in Buenos Aires, Argentina, Sunday, July 5, 2015. Buenos Aires will have a runoff election that would have the current Cabinet Chief of Buenos Aires and mayoral candidate Horacio Rodriguez Larreta competing against Martín Lousteau, candidate of the ECO coalition. (AP Photo/Daniel Jayo)

    Carrying his daughter Antonia and surrounded by supporters, the current Mayor of Buenos Aires and presidential candidate Mauricio Macri celebrates at the end of mayoral elections in Buenos Aires, Argentina, Sunday, July 5, 2015. Buenos Aires will have a runoff election that would have the current Cabinet Chief of Buenos Aires and mayoral candidate Horacio Rodriguez Larreta competing against Martín Lousteau, candidate of the ECO coalition. (AP Photo/Daniel Jayo)  (The Associated Press)

  • Carrying his daughter Antonia, surrounded by supporters, the current Mayor of Buenos Aires and presidential candidate Mauricio Macri celebrates at the end of mayoral elections in Buenos Aires, Argentina, Sunday, July 5, 2015. Buenos Aires will have a runoff election that would have the current Cabinet Chief of Buenos Aires and mayoral candidate Horacio Rodriguez Larreta competing against Martín Lousteau, candidate of the ECO coalition. (AP Photo/Daniel Jayo)

    Carrying his daughter Antonia, surrounded by supporters, the current Mayor of Buenos Aires and presidential candidate Mauricio Macri celebrates at the end of mayoral elections in Buenos Aires, Argentina, Sunday, July 5, 2015. Buenos Aires will have a runoff election that would have the current Cabinet Chief of Buenos Aires and mayoral candidate Horacio Rodriguez Larreta competing against Martín Lousteau, candidate of the ECO coalition. (AP Photo/Daniel Jayo)  (The Associated Press)

A Buenos Aires mayoral candidate aligned with Argentina's top opposition presidential contender has won the first round of city elections.

With 92 percent of election places reporting late Sunday, Horacio Rodriguez Larreta had 45 percent of the vote. Less than 50 percent will mean a runoff in two weeks between Rodriguez and Martin Lousteau, who got 25 percent of the vote.

Larreta, from the Republican Proposal party, is Cabinet chief for Mauricio Macri, the out-going mayor of Buenos Aires who is the top opposition contender for the presidential contest in October.

The results show Macri's party continues to enjoy wide support in Argentina's largest city. Macri has been mayor since 2007.

Sunday's elections included governor and legislator spots in a handful of places across Argentina, including Cordoba.