*While D.C. United is in Utah for tonight’s MLS match against Real Salt Lake (9 p.m. ET, Comcast SportsNet/DC), concussions continue to haunt the club.

*C.J. Sapong (Forest Park High School, James Madison University, D.C. United youth academy) scored the first MLS goal in Livestrong Sporting Park history, lifting rejuvenated Sporting Kansas City to a 1-0 victory over the San Jose Earthquakes in front of a sellout crowd of 18,467.

*While the country-club set politely mingles at Congressional for the U.S. Open (and my paper provides coverage on the front page of every major print-edition section today, plus a Sunday magazine cover story), the biggest, most passionate and diverse crowd of the weekend will turn out at RFK Stadium for Sunday’s Gold Cup quarterfinal doubleheader.

Much more.....

CONCACAF announced Friday night that the event is sold out. Official capacity has not been revealed, but with obstructed-view seats sold as soon as they were made available, the total could reach 47,000 to 48,000. Anticipating traffic back-ups and long lines at will-call windows, organizers are urging fans to arrive early. Parking lots will open at 11 a.m., four hours before the USA-Jamaica match begins. Fan Fest in Lot 8 starts at 1 p.m.

Today’s matches at New Meadowlands Stadium in New Jersey — Costa Rica vs. Honduras at 5 p.m. (Telefutura) and Mexico vs. Guatemala at 8 (Univision) — are also fully booked (80,000+).

*As the international signing period approaches, American goalkeeper Marcus Hahnemann (Wolves), defender-midfielder Jonathan Spector (West Ham) and forward Eddie Johnson (Fulham) are on the free agent list in England. Both Hahnemann and Johnson have attracted interest in MLS circles.