* Who: National teams of El Salvador and Guatemala.

* Where: RFK Stadium.

* When: 7:30 p.m.

* Tickets: $25 in advance, $30 at the gate.

* Data: A crowd of between 10,000 and 20,000 is expected for this Central American friendly between teams gearing up for the start of the semifinal round of World Cup qualifying Aug. 18. El Salvador, which has added former MLS star Jorge Rodriguez to the roster after a long absence, will host Panama in Group A. Guatemala, which will have star striker Carlos Ruiz of the Los Angeles Galaxy, is preparing to play at Canada in Group B. . . . The Salvadorans are making their fourth visit to Washington in the last two years, having lost to the United States, D.C. United and Colombia by a combined score of 7-1. Guatemala visited RFK for World Cup qualifiers against the Americans in 1996 and 2000. . . . The Salvadorans, who are coming off a 4-0 loss at home to Honduras on Tuesday, last met Guatemala in a friendly July 18 in Los Angeles, losing 1-0. . . . Two U.S. scouts will be at tonight's game, preparing for their qualifier against El Salvador on Sept. 4 in Foxboro, Mass.

-- Steven Goff