CARSON, Calif., June 9 (Reuters) - The United States reached the CONCACAF Gold Cup quarter-finals with a 2-0 win over Trinidad & Tobago and Guatemala secured their first win in the competition for 11 years by beating El Salvador 1-0 on Saturday.The U.S. lead the Group B standings with six points from two games. Guatemala and El Salvador are tied for second place with three points each and Trinidad & Tobago are bottom after losing their first two matches. Jose Contreras scored Guatemala's goal in the 69th minute, running on to Dwight Pezzarossi's header and striking a 20-metre shot past diving goalkeeper Degoberto Portillo. The victory ended Guatemala's 15-match winless streak at the Gold Cup, their previous victory coming in 1996, 3-0 against St.Vincent and the Grenadines. Portillo replaced El Salvador goalkeeper Juan Gomez in the 45th minute after Gomez collided with team mate Alexander Escobar and was carried off the field on a stretcher. Brian Ching gave the United States a 1-0 lead against Trinidad & Tobago in the 29th minute. Justin Mapp took Jonathan Spector's through ball down the left flank, beat defender Seon Power and crossed for Ching to score from close range. Eddie Johnson wrapped up victory in the 54th minute following a U.S. counter-attack, the goal set up by Landon Donovan. American goalkeeper Kasey Keller made two key saves in his 99th international, securing Bob Bradley's sixth win in seven matches as U.S. coach.