Major League Soccer
Emilio signed with D.C. United on 16 January 2007, as a Senior International player, after completing his second stint with Honduran club Olimpia. Emílio debuted for United in the 2007 CONCACAF Champions’ Cup against Olimpia, scoring once in Tegucigalpa and twice in the return leg in Washington, DC in United’s 7–3 aggregate win. He went on to score a fourth time in three games versus C.D. Guadalajara in the opening game of the CONCACAF semi-final.
At the end of his first season with D.C. United, his team received the 2007 MLS Supporters’ Shield, the award for gaining the most points overall in a season. In the 2007 MLS season, Emílio had 20 goals and won the MLS Golden Boot award. Emílio won the 2007 MLS MVP award and the inaugural 2007 MLS Newcomer of the Year Award.
After recovering from a lean start to the 2008 season, Emílio scored his first career MLS hat-trickon 14 June against New York Red Bulls.
Though not originally signed under the Designated Player Rule, he later received a pay rise which took him over the maximum salary covered by the league, becoming a designated player.
Emílio received a green card in August 2009 for permanent residency in the United States and counted no longer against DC United’s foreign player limit.
Emílio rejected a new contract with D.C. United that would have seen him sign at a significantly lower salary. He later joined former club Rio Branco, but on April 28, 2010, Emilio signed a three-month contract to return to former club D.C. United. He was released by D.C. United at the end of this short-term contract.