In 2008, he won the Cartier Queen's Cup, though he didn’t participate in the final match because of an injury, and in 2013 on the team of Zacara played with Lydon Lea, Hilario Ulloa, and Matias Gonzalez.

Facundo has won the most important tournaments of the World Polo Tour, the Spanish Grand Slam, Gold Cup, Sotogrande 2018 (American Team 'La Indiana') and 2017 with the Spanish team Ayala, Torneo Internacional de Polo Sotogrande.

He started playing in the Campeonato Argentino Abierto de Polo in 2003 and made it into the finals twice with Ellerstina; first in 2005 and again in 2007, though both ended in overtime losses.

In June, 2019, Pieres broke royal protocol as he was presented the winner’s trophy at the Cartier Polo Cup in Windsor Great Park, Berkshire.

Pieres placed a hand on the top of the Queen’s back and again on her shoulder as Her Majesty presented him with the 'most valuable player' award.