FC Dallas midfielder Kellyn Acosta was named to the 40-man provisional U.S. national team roster for this summer's Copa America Centenario.The tournament will celebrate the 100th anniversary of the South American championship, with the U.S. and five other teams from CONCACAF -- the North and Central American and Caribbean confederation -- set to take part.Acosta normally plays as a central midfielder for FC Dallas, and said Tuesday he prefers that position, but the U.S.