He also had two stints in New York-area amateur leagues before joining the Wizards. He started Saturday night because Teal Bunbury was suspended.
Kansas City went past New England into fifth place with 23 points in the Eastern Conference. Kenny Mansally scored for the Revs.
Diop assisted on Kei Kamara's goal in the 65th minute for a 3-1 lead. Jack Jewsbury replaced Diop in the 66th and scored 3 minutes later.