 .A 2006 graduate of Monsignor Edward Pace High School in Miami, Florida, Marrero was selected by the Washington Nationals with the 15th overall pick in the 2006 amateur draft and signed for a bonus of $1.625 million.Marrero and former teammate Gio González briefly played together during their high school years at Monsignor Edward Pace High School when Gonzalez transferred there in 2004.