He earned 15 caps with the U.S. national team and was chosen second overall in the 1996 MLS Inaugural Player Draft by the Colorado Rapids.
[3][4] The Diplomats had struggled to score that season, but Harbor made an immediate impact and the team went on to win the ASL championship.
Harbor continued his high-scoring ways in the 1989 season, but was suspended by the league after striking Pedro Magallanes in the face during a game with the Fort Lauderdale Strikers.
[6] With the collapse of the Bays, Harbor moved indoors in the fall of 1991 with the Baltimore Blast of the Major Soccer League.
Harbor led the league in scoring with 13 goals and four assists in 15 games, earning first-team all-star honors.
In that first season, Harbor led the team in scoring with 11 goals in 29 games, but the Rapids finished at the bottom of the table and failed to make the playoffs.
[12] That season, Harbor also helped lead Seattle to the final CISL championship, defeating the Houston Hotshots two games to zero.
In October 1997, Harbor moved to the Florida ThunderCats of the NPSL as the team began preparations for its first and ultimately, only, season.
The ThunderCats had significant financial problems during the 1998–1999 season and sold Harbor's contract to the Philadelphia KiXX before the 1999 playoffs.
Milutinović dropped him from the national team after the 1993 Copa América, but he earned one more cap under Steve Sampson on October 16, 1996.
He was a highly regarded recruit at Archbishop Carroll High School in Washington who won the 2023 Franklin D. Watkins Memorial Award, which recognizes African American senior male high-school athletes who demonstrate academic, athletic, and community-service excellence.