He led the collegiate team to its first NCAA title at the 2009–10 season ending San Beda College eight-year championship winning streak.
Maro's staff for the tournament to be held in December 2017 consists of team manager, Jefferson Cheng and assistant coach Randolfo Clarino, Marlon Piñero, Ronoel Garfin, and Ramonito Carreon.
The Philippine Football Federation (PFF) planned to send the U22 national team which Maro is also head coach but decided to add a select number of senior players from Davao Aguilas and Stallion Laguna.
[2][4] On July 10, 2021, the Philippine Football Federation announced that they have appointed Maro to lead the national team again starting at the 2022 AFC Women's Asian Cup qualifiers.
[18] At the 2013 Kanga Cup, under the club name Carranz F.C., the Philippine U18 team, led by Maro, won the U18 male division of the youth tournament beating Capital Football Senior NTC in the finals; 1–0.
[2] Marlon Maro, led the 2008 and 2009 Philippine squads that participated at the Homeless World Cup, a football competition for street children of several countries.