Professional Mapp graduated from the
Bradenton Academy in 2001 and signed with MLS as a
Project-40 player. He was drafted by
D.C. United with the fourth overall pick in the
2002 MLS SuperDraft, but played only 28 minutes for DC in his first year as a pro. The
Chicago Fire acquired Mapp for
Dema Kovalenko before the 2003 season, and he has been an important player in the squad since, helping them to the 2003
US Open Cup. In two seasons with the Fire, Mapp scored six goals and added seven assists. After eight years with Chicago, Mapp was traded to
Philadelphia Union on July 26, 2010, in exchange for allocation money. Mapp won "MLS Player of the Week" honors in Week 11 of the 2011 season for his 2-goal performance in the club's 6–2 win against
Toronto FC. This performance earned the recognition of the North American Soccer Reporters society. One of his goals was even nominated for the MLS Goal of the Week award. On June 8, Mapp was named a nominee for the
MLS All-Star Game. On June 28, he was said to be leading in text voting for the All-Star Game. After a season and a half with Philadelphia, Mapp was selected by expansion franchise
Montreal Impact in the
2011 MLS Expansion Draft on November 23, 2011. He said he was surprised to be unprotected by the Union. On May 29, 2013, Mapp was awarded the
2013 George Gross Memorial Trophy for his play in the Canadian Championship, leading Montreal to victory over
Vancouver Whitecaps FC in the final. A year later, he claimed the award again after Montreal defeated
Toronto FC in the
2014 final making him one of only two players, the other being
Dwayne De Rosario, to win the award twice. After his contract expired following the 2015 season, Mapp signed with Sporting Kansas City, becoming the first free agent signing in MLS history. He played six times for Kansas before retiring at the end of 2017.
International Mapp has played for various youth
United States national teams, including the 2001
Under-17 World Championship in
Trinidad and Tobago. He started all five matches for the U.S. in the 2003
World Youth Championship in the
United Arab Emirates. Mapp made his debut for the senior team on October 12, 2005, against
Panama. Mapp also came on as a sub January 20, 2007, against
Denmark, running 70 yards with the ball before setting up
Jonathan Bornstein's game-winning goal. He also played for USA in
Copa América 2007. == Career statistics ==