The prolific forward led the way as his side ran out to an impressive 6-2 win.
The forward netted three times and was credited with an assist as part of Seattle's resounding win.
Brad Evans got the goals going 10 minutes into the match, but Montero took over for the rest of the half. He netted his first of the night in the 27th and scored his second in the 34th.
Juan Agudelo and Miller Bolaños pulled Chivas USA back into the match with goals in the 38th and 64th respectively, but Montero put the result beyond doubt in the 67th with his third.
A powerful header from Samuel Ochoa and an own goal from Ante Jazic late on rounded out the lopsided scoreline.
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