In his first season as a pro, Adu finished the, Adu was relegated to a substitute when D.C. United acquired central midfielder Christian Gómez mid-season, and it was in this role that he appeared in United's MLS Cup victory.
In his first season as a pro, Adu finished the year with five goals and three assists, while playing in all 30 regular season games. Although briefly a starter, Adu was relegated to a substitute when D.C. United acquired central midfielder Christian Gómez mid-season, and it was in this role that he appeared in United's MLS Cup victory.