August 12 in Washington D.C. Luis Angel Firpo (El Salvador) 0 Los Angeles Galaxy (MLS) 2. Goals: Welton 45, Hurtado 78. Luis Angel Firpo — Hernandez, Carcarno, Rivera, P.Vasquez (G.Garcia, 28), Joya, De Freitas, Cubias (Osegura, 80), Da Silva (Monterosa, 67), J.Garcia, Castro, Pigott. Los Angeles — Campos, Caligiuri, Pena, J.Vasquez, Machon, Vanney, Laterza (Hartman, 46), Jones, Jara (Welton, 34), Karapetyan (Lak, 62), Hurtado. Yellow cards: Los Angeles — Pena 43. Referee: Felipe Ramos Rizo. D.C. United (USA) 1 United Petrotrin (Trinidad & Tobago) 0. Goal: Etcheverry 84. D.C. United — Garlick, Vaudreuil, Gori (Pope, 60), Agoos, Llamosa, R.Williams, Harkes, Etcheverry, Wegerle, Sanneh, Diaz Arce (Marsch, 90). United Petrotrin — K.Francis, B.Williams, D.Francis, Bartholomew, Julien, F.Seales, Joseph (D.Seales, 71), Morris, John, Cyrus (Jones, 66), Prosper. Yellow cards: United Petrotrin — Williams 37. Referee: Peter Pendergast. Att.: 10,063. August 16 in Mexico City Cruz Azul (Mexico) vs. Comunicaciones (Guatemala) at 1:00 p.m. (ET). August 17 in Guadalajara Guadalajara (Mexico) vs. Cartagines (Costa Rica) at 1:00 p.m. (ET). This weekend’s matches will be shown live on Univision. The semifinals will be held Aug. 22 at RFK Stadium, and the final will be Aug. 24 at RFK Stadium.