BRIDGETOWN, Barbados — The United States advanced to the regional semifinals of qualifying for the 2010 World Cup with a listless 1-0 victory over Barbados today.

Eddie Lewis scored in the 21st minute off a through ball from 19-year-old Freddy Adu, who started his first World Cup qualifier. Lewis took the pass and put the ball through the legs of goalkeeper Alvin Rouse for his 10th goal in 80 international appearances.

The United States already was way ahead in the home-and-home, total-goals series following a rout at Carson, Calif., on June 15, and advanced on 9-0 aggregate. The U.S. has outscored Barbados 20-0 in four meetings, all World Cup qualifiers, including two matches in 2000.

The Americans, seeking their sixth straight World Cup berth, will be joined in the regional semifinals by Guatemala, which defeated St. Lucia on 9-1 aggregate.

The other two teams were to be determined later Sunday. Cuba hosted Antigua and Barbuda after winning the first leg 4-3 on the road. Trinidad and Tobago, which made its first World Cup appearance in 2006, went to Bermuda trying to overturn a 2-1 deficit.

Barbados, a Caribbean island nation of about 282,000 people, nearly tied the score in the 58th minute when Emerson Boyce's header beat goalkeeper Brad Guzan but bounced off the crossbar. John Parris put the ball in the net for Barbados in the 86th after Mark McCammon won a challenge with Guzan, but McCammon was whistled for being offside.

The United States changed seven starters from the first leg, keeping only Guzan, defender Heath Pearce, midfielder Michael Bradley and DaMarcus Beasley, who pushed up to forward.

Three of the U.S. starting midfielders — Bradley, Danny Szetela and Sacha Kljestan — could be part of the American Olympic team this summer, along with Adu.

It was 88 degrees on the field at Kensington Oval, a cricket ground.

U.S. midfielder John Thorrington entered in the 79th minute, his second international appearance and first since June 7, 2001, against Ecuador.

Eddie Lewis scored in the 21st minute off a through ball from 19-year-old Freddy Adu, who started his first World Cup qualifier. Lewis took the pass and put the ball through the legs of goalkeeper Alvin Rouse for his 10th goal in 80 international appearances.

The United States already was way ahead in the home-and-home, total-goals series following a rout at Carson, Calif., on June 15, and advanced on 9-0 aggregate. The U.S. has outscored Barbados 20-0 in four meetings, all World Cup qualifiers, including two matches in 2000.

The Americans, seeking their sixth straight World Cup berth, will be joined in the regional semifinals by Guatemala, which defeated St. Lucia on 9-1 aggregate.

The other two teams were to be determined later Sunday. Cuba hosted Antigua and Barbuda after winning the first leg 4-3 on the road. Trinidad and Tobago, which made its first World Cup appearance in 2006, went to Bermuda trying to overturn a 2-1 deficit.

Barbados, a Caribbean island nation of about 282,000 people, nearly tied the score in the 58th minute when Emerson Boyce's header beat goalkeeper Brad Guzan but bounced off the crossbar. John Parris put the ball in the net for Barbados in the 86th after Mark McCammon won a challenge with Guzan, but McCammon was whistled for being offside.

The United States changed seven starters from the first leg, keeping only Guzan, defender Heath Pearce, midfielder Michael Bradley and DaMarcus Beasley, who pushed up to forward.

Three of the U.S. starting midfielders — Bradley, Danny Szetela and Sacha Kljestan — could be part of the American Olympic team this summer, along with Adu.

It was 88 degrees on the field at Kensington Oval, a cricket ground.

U.S. midfielder John Thorrington entered in the 79th minute, his second international appearance and first since June 7, 2001, against Ecuador.