The Union has been plagued by injuries and suspensions but its depth proved decisive again.
Making his second start at right back, 21-year-old Cameroonian Olivier Mbaizo set up Pole Kacper Przybylko for the opening goal. In Saturday's 1-1 tie at Vancouver, his first start of the season, Przybylko also scored.
Harvard product Matt Freese again got the start in goal with Andre Blake out injured, but the Homegrown Player signing was injured in the first half and had to leave the game in favor of third-string keeper Carlos Coronel, who was signed on loan from Red Bull Salzburg in the offseason. Wednesday's game marked the second time in three matches Union keepers have shared the shutout.
Fafa Picault added the second goal for the Union, whose 17 points in 10 games are tied with D.C. United and Montreal.
The win gave the Union a series sweep over expansion Cincinnati, whose 2-0 loss at home on March 30 started it on a winless streak that has hit six games. It is 0-5-1 with only one goal scored.