Club: CD Marathon (HON)
Founded: 1925
City: San Pedro Sula, Honduras
Stadium: Estadio Olimpico
Manager: Manuel Keosseian 
Qualification method: Non-champion with best aggregate record in Honduran 2011-12 season
Previous CONCACAF Champions League appearances: 2008-09 (Quarterfinals), 2009-10 (Quarterfinals), 2010-11 (Group Stage)
Honors: Honduran League - 8 (1979-80, 1985-86, Clausura 2001-02, Clausura 2002-03, Apertura 2004-05, 2007-08 Apertura, 2008-09 Apertura, 2009-10 Apertura); Honduran Cup - 1 (1994)
Official website: http://www.cdmarathon.com

Formed in 1925 by Eloy Montes and his friends, Club Deportivo Marathon is one of the most prestigious clubs in Honduras and will be making its fourth CONCACAF Champions League appearance. Marathon qualified for each of the first three competitions, reaching the quarterfinals in the first two years. In 2008-09 "El Monstruo Verde" (The Green Monster) won its group, but was upset by the Puerto Rico Islanders in the knockout stage. In 2009-10, Marathon fell to Pumas UNAM of Mexico in the quarterfinals. The only Honduran team to beat Argentine powerhouse River Plate, Marathon is coached by Manuel Keosseian, who led the club to three titles from 2007-2009 and replaced Ramon Maradiaga just before the start of the Champions League. Marathon is led by Honduran international defender Jerry Palacios, who competed in the 2010 World Cup with brothers Johnny and Wilson. They became the first trio of siblings to represent a single nation in the same World Cup. Veteran defenders Mario Beata and Mauricio Sabillon also highlight the squad.