The Americans gained three needed points thanks to Clark's powerful, swerving shot from 30 yards out, which eluded the outstretched arms of Trinidad and Tobago goalkeeper Clayton Ince.

The day started with the top four teams - Honduras, the United States, Mexico and Costa Rica - separated by just one point.

Later Wednesday, Mexico hosted Honduras and El Salvador hosted Costa Rica. El Salvador and Trinidad and Tobago, who both started the day on five points, had to win to avoid elimination.

The top three teams advance directly to South Africa 2010, while the fourth-placed team plays off for a berth against the fifth-placed finisher from South America.