With two group matchdays remaining, the CONCACAF Gold Cup quarterfinal pairings are taking shape.

What we know: Group A winner Panama and runner-up Mexico will play their respective knockout games at Georgia Dome in Atlanta on Saturday. The United States and Costa Rica are headed to M&T Bank Stadium in Baltimore for Sunday’s games.

If the Americans defeat or tie Costa Rica on Tuesday night (8 p.m. ET, Fox Soccer, UniMas) in East Hartford, Conn., they’ll win Group C and face a third-place team from A or B in the quarterfinals. Possible opponent: Martinique, Haiti, El Salvador or Trinidad & Tobago. A loss to the Ticos would result in a probable quarterfinal against Honduras.

Without the participants known, ticket sales in Baltimore were slow, but with the U.S. team on its way and at least two Central American sides booked, a decent turnout is now expected.

Group B will settle matters tonight in Houston as El Salvador (one point) faces Haiti (three) and Honduras (six) faces T&T (one).

Canada’s campaign ended in misery with a 0-0 draw against Panama on Sunday, leaving the Canadians in last place (0-2-1) and in an 0-7-2 rut with two goals for and 20 against since last October. D.C. United’s Kyle Porter, who played the final 25 minutes for Canada, will rejoin the MLS club for training Tuesday.

Smashing goal by Mexico’s Luis Montes in a 3-1 victory over Martinique yesterday:

Gedion Zelalem in Indonesia. (Getty Images) Gedion Zelalem, left, in Indonesia. (Getty Images)

*Gedion Zelalem, the 16-year-old midfielder who lived in the Washington area for six years and starred for Walter Johnson High School and Olney Rangers, played the second half of Arsenal’s first Asian tour game — a 7-0 victory over an Indonesia squad in Jakarta. The Gunners will perform in Vietnam on Wednesday.

D.C. United midfielder Syamsir Alam, who made his debut last Friday against Chivas Guadalajara, has been called up by Indonesia for Saturday’s friendly against Liverpool in Jakarta. UPDATE: Alam was called for an under-23 camp. It is unclear whether he will play against Liverpool.

*Former Georgetown Prep star Andy Riemer, a Los Angeles Galaxy draft pick who helped Georgetown to the College Cup final last season, is making a go at a career in Germany.

*This afternoon, Sporting Kansas City Coach Peter Vermes will announce his 18-man roster for the MLS All-Star Game against Roma on July 31 at Sporting Park. In all, 32 players will merit all-star status, but Vermes will narrow the list for actual participation. Will Landon Donovan‘s 12-year all-star streak come to an end?

*Americans abroad:

Terrence Boyd entered in the 75th minute of Rapid Vienna’s shock loss to third-tier LASK Linz on penalties in the first round of the Austrian Cup (0-0 through 120 minutes, 5-4 in the tiebreaker). Shawn Berry, who featured for NCAA champion Virginia in 2009 before skipping his final two years of eligibility, played the full match for Linz.

In Brazil, Freddy Adu made the 18 but did not play in Bahia’s 0-0 draw at Ponte Preda. He has entered one of six Serie A matches for seven minutes.

In Sweden, Brian Span played the final 15 minutes of Djurgarden’s 2-0 loss at Mjallby.

*Coming soon to a bookstore (a what?) or e-book near you:

Those Feet: A Sensual History of English Soccer,” by David Winner, author of “Brilliant Orange.” “Winner shows how Victorian sexual anxiety underlies England’s many World Cup failures.”

When Friday Comes: Football, War and Revolution in the Middle East,” by James Montague. “By observing the Middle East’s culture and politics through the prism of football, When Friday Comes uncovers how football distills something of the region’s identity: its hope, dreams, flaws and strengths.”