Union midfielder Sebastien Le Toux improved his candidacy for league MVP, breaking the shutout in the 87th minute. Le Toux leads the team with 14 goals and 11 assists.
For Columbus, Gaven drew a penalty that Guillermo Barros Schelotto converted in the 15th minute, then fed Emilio Renteria to make it 2-0 in the 42nd minute. Andres Mendoza added a third goal in the 79th.
The Union (8-15-7, 31 points) finished its inaugural season with a dismal 2-12-1 mark away from PPL Park. The club finished seventh in the Eastern Conference in front of D.C. United.
"I think when we look back at the start of the year, we all knew we were going to be on the road, but until you actually do it [it's a much different story]," said Union assistant John Hackworth. "If things had gone differently, and you say, 'OK, your first six games you aren't on the road the whole time,' who knows, maybe we go 3-3 and we aren't digging ourselves out of a tremendous hole . . . I absolutely can't wait to start next season with a relative homestand."