El Salvador’s Osael Romero, right, greets teammate Ricardo Ulloa following Ulloa’s first-half goal against Guatemala in a friendly on Saturday in Carson, Calif. (Alex Gallardo/Associated Press)

International friendlies

Where: RFK Stadium.

When: Wednesday.

Matches: Guatemala vs. Paraguay, 6 p.m.; El Salvador vs. Jamaica, 8 p.m.

Tickets: $42.75 and $52.75.

Outlook: While the U.S. national team faces arch-nemesis Mexico on Wednesday night in a friendly at Azteca Stadium (7:30 p.m., ESPN2, Univision), two of the Americans’ adversaries in their World Cup qualifying group are in town for tuneups ahead of semifinal-round qualifiers next month. The United States and Jamaica, tied atop CONCACAF’s Group A with four points apiece through two matches, will meet Sept. 7 in Kingston and four days later in Columbus, Ohio. Guatemala is preparing for two games against Antigua & Barbuda.

Nine MLS players are on the current Reggae Boyz roster, including Vancouver Whitecaps F Darren Mattocks, the rookie of the year favorite. El Salvador, a regular visitor to Washington in recent years, is preparing for two qualifiers against Guyana next month. The squad includes former D.C. United MFs Eliseo Quintanilla and Christian Castillo. In Coach Juan de Dios Castillo’s debut Saturday, the Salvadorans defeated Guatemala, 1-0, in a friendly in Carson, Calif. El Salvador’s previous visit to RFK was June 2, a 3-0 loss to Honduras.

Guatemala’s top players are Chicago Fire MF Marco Pappa, who will move to Dutch club Heerenveen after the MLS season, and former MLS scoring leader and MVP Carlos Ruiz.

Paraguay is the most accomplished of the teams at RFK, having appeared in the past four World Cups and reached the quarterfinals in 2010 before losing to eventual champion Spain. Los Guaranies are seeking to regain form after a 1-3-1 start to South America’s World Cup qualifiers. Their September matches are at Argentina (3-1-1) and home against Venezuela (2-2-2). Paraguay’s roster includes F Roque Santa Cruz, who is tied for the national team scoring record with 25 career goals. He is under contract with Manchester City but was on loan with Spain’s Real Betis last season and might move to Germany’s Werder Bremen.

— Steven Goff