A jury on Friday convicted 38-year-old Otis Phillips and 23-year-old Jeffrey Phillips of first-degree murder in the death of 47-year-old tournament organizer Herman Curry. The two defendants, who are not related, also were convicted of manslaughter in the death of 16-year-old soccer player Alexander Kamara at Wilmington's Eden Park.
Otis Phillips also was convicted of second-degree murder in the 2008 killing of Christopher Palmer, a friend of Curry.
Prosecutors plan to seek the death penalty.
Authorities say some spectators returned fire on the suspects, killing a third alleged gang member.