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Onyewu's professional soccer career began in the United States, where he played for D.C. United from 2000 to 2003. During his time with D.C. United, he established himself as a talented defender and helped the team win the MLS Cup in 2004. Onyewu's success in the MLS caught the attention of European clubs, and he eventually moved to play for several teams in Belgium, England, and France.