After acquiring a 3–0 record in smaller shows, Cantwell made his WEC debut at WEC 26 in 2007 against Brian Stann, where he suffered a quick TKO loss.
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He rematched Brian Stann, the man he defeated to become the last reigning WEC Light Heavyweight Champion for the second time at UFC Fight Night 19, Cantwell lost the rubber match via unanimous decision.
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Muñoz was one of the chosen few to be relocated to WEC's sister promotion—which is also owned and produced by Zuffa—along with light heavyweight champion Steve Cantwell, light heavyweight contenders Brian Stann and Steve Steinbeiss and middleweight contenders Chael Sonnen and Nissen Osterneck.