BEIJING — Promise Isaac and Victor Obinna scored Wednesday to lead Nigeria over 10-man United States 2-1, earning a place in the quarterfinals of the Olympic soccer tournament and eliminating the Americans.

Isaac scored in the 39th minute with an easy tap-in off Chinedu Ogbuke Obasi's centering pass, and Obinna curled a right-footed shot into the top of goal in the 80th.

Sacha Kljestan converted an 88th-minute penalty for the Americans and substitute Benny Feilhaber headed onto the post in the 90th, as the United States was eliminated from Group B after the Netherlands beat Japan.

The Americans played with 10 men from the third minute when defender Michael Orozco was ejected.