Second-half substitute Jaime Ayovi beat defender Tim Ream to a cross and scored in the 79th minute, giving Ecuador a 1-0 exhibition win over the United States on Tuesday night in yet another setback for the Americans under new coach Jurgen Klinsmann.

Ayovi was marked by Ream about 8 yards from the goal but easily got free of the young defender and headed Walter Ayovi's cross to the left of goalkeeper Tim Howard in one of the few scoring chances for either team. Ream, who has thus far struggled to establish himself with the national team, replaced American captain Carlos Bocanegra in the 72nd minute.

Ayovi also scored the first goal Friday night as Ecuador opened World Cup qualifying with a 2-0 home win over Venezuela.

The game was the fifth for the U.S. since Klinsmann, a former German national team star and coach, replaced Bob Bradley in July. The Americans are 1-3-1 under Klinsmann, entering with a tie against Mexico, losses to Costa Rica and Belgium, and a 1-0 win over Honduras last weekend. With no competitive games until the start of World Cup qualifying in June, Klinsmann is experimenting with players and formations.

Thus far, the Americans are playing higher upfield and using more width but creating few scoring chances. Then again, Klinsmann has not had Landon Donovan (strained quadriceps) and Clint Dempsey available for the same game.

Before a pro-Ecuador crowd of 20,707, both teams had trouble with the slippery surface at Red Bull Arena, hosting the U.S. for the first time since opening last year.

The U.S. made just one change from Saturday's 1-0 win over Honduras, putting Oguchi Onyewu in central defense for the first time since June and dropping Michael Orozco Fiscal, who didn't dress. Klinsmann made four changes at the start of the second half, bringing on Jonathan Spector, Michael Bradley, DaMarcus Beasley and Juan Agudelo for Steve Cherundolo, Maurice Edu, Brek Shea and Jozy Altidore.

Other than Dempsey and Howard, the Americans were largely ineffective during the first half in their 4-1-3-1 formation, repeatedly bringing the ball upfield only to lose possession and hustle back to defend counterattacks. They created a few chances in the second half, but none of them really open.

Ecuador used just five of the starters who began Friday's game in Quito.