=== Ultimate Fighting Championship ===
Rountree debuterede den 8. juli 2016 på UFC The Ultimate Fighter 23 Finale til TUF 23 Light Heavyweight-titel mod Andrew Sanchez. <ref name="auto1">{{Kilde nyheder|url=https://www.bloodyelbow.com/2016/7/7/12112012/ufc-tuf-23-finale-jedzrejczyk-vs-gadelha-weigh-in-results-live-video-stream|title=TUF 23 Finale weigh-in results: Joanna 114.5, Gadelha 115|work=Bloody Elbow|access-date=2017-07-01}}</ref> <ref name="auto2">{{Kilde nyheder|url=http://mmajunkie.com/2016/07/tuf-23-finale-lineup-set-with-rountree-sanchez-cooper-suarez-tourney-finals|title=Friday's TUF 23 Finale lineup set with Rountree-Sanchez, Cooper-Suarez tourney finals|date=2016-07-07|work=MMAjunkie|access-date=2017-07-01|language=en-US}}</ref> Han tabte kampen ved enstemmig afgørelse. <ref>{{Kilde nyheder|url=https://www.mmamania.com/2016/7/9/12133518/tuf-23-finale-results-andrew-sanchez-khalil-rountree-decision-light-heavyweight-season-mma|title='El Dirte' Dominates Rountree, Win TUF 23 Final|work=MMAmania.com|access-date=2017-07-01}}</ref>
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