På [[UFC Fight Night: Chiesa vs. Lee]] den [[25. juni]], 2017, mødtes Penn og [[Dennis Siver]].<ref>{{cite news|url=http://mmajunkie.com/2017/03/b-j-penn-dennis-siver-johny-hendricks-tim-boetsch-at-ufc-fight-night-112-in-oklahoma-city|title=B.J. Penn-Dennis Siver, Johny Hendricks-Tim Boetsch at UFC Fight Night 112 in Oklahoma City|publisher=mmajunkie.com|author=Staff|date=2017-03-22|access-date=2017-03-22|archive-date=30. juni 2018|archive-url=https://web.archive.org/web/20180630161633/https://mmajunkie.com/2017/03/b-j-penn-dennis-siver-johny-hendricks-tim-boetsch-at-ufc-fight-night-112-in-oklahoma-city|url-status=live}}</ref> Siver vandt kampen via en tæt dommerafgørelse.<ref>{{Cite news|url=http://www.bjpenn.com/mma-news/ufc-fight-night-112/ufc-fight-night-112-results-dennis-siver-defeats-bj-penn-decision/|title=UFC Fight Night 112 results: Dennis Siver defeats BJ Penn by decision (highlights) {{!}} BJPenn.com|date=2017-06-25|work={{!}} BJPenn.com|access-date=2017-06-26|language=en-US|archive-date=11. juli 2018|archive-url=https://web.archive.org/web/20180711021822/https://www.bjpenn.com/mma-news/ufc-fight-night-112/ufc-fight-night-112-results-dennis-siver-defeats-bj-penn-decision/|url-status=live}}</ref>
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