Anthony Fontana came off the bench and took over the match Saturday night, leading Philadelphia Union to a 2-1 victory with a second half brace.
Fellow substitute Tajon Buchanon scored for the Revs, who finally broke through in their third match against Andre Blake in 2020.
The Union are now in second place in the Eastern Conference and sport the third-best goal differential in Major League Soccer.
Jim Curtin handed Andrew Wooten a start up top alongside Kacper Przybylko but otherwise kept the same lineup on the field that demolished New York Red Bulls last Sunday evening.