Cummings mødte Trevor Smith den 15. december 2018 på UFC på Fox 31. <ref>{{Cite web|url=http://mmadna.nl/zak-cummings-vs-trevor-smith-toegevoegd-aan-ufc-milwaukee-card/|title=Zak Cummings vs. Trevor Smith toegevoegd aan UFC Milwaukee card|last=DNA|first=MMA|website=mmadna.nl|language=en-US|access-date=2018-11-10}}</ref> Han vandt kampen via enstemmig afgørelse. <ref>{{Cite web|url=https://cagesidepress.com/2018/12/15/ufc-milwaukee-results-trevor-smith-vs-zak-cummings/|title=UFC Milwaukee Results: Zak Cummings Wins Split Decision Over Trevor Smith|last=Anderson|first=Jay|date=2018-12-15|website=Cageside Press|language=en-US|access-date=2018-12-16}}</ref>
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