What happened: Paxten Aaronson started, while Keegan Rosenberry began among the substitutes. The visitors had trailed since a 22nd-minute header.
Why it matters: Columbus scored four minutes after the switch and again in stoppage time. The 3-0 defeat halted Colorado's stretch of four wins in five matches.
By the numbers: Colorado fell to 10-12-1 with 31 points, seventh in the West. Columbus improved to 6-12-5 with 23 points, 13th in the East.
What to watch: Colorado visits Austin FC on Wednesday, Sept. 9, at 6:30 p.m. MT.