Who wins?

Knocking out Dustin Poirier at featherweight (2014) vs Fighting Floyd Mayweather (2017)

Fighting Floyd Mayweather (2017) wins 71% to 29%. 22 more put them in the same row. From Conor McGregor's Greatest Moments Tier List. Pick a side.

jen.c9 on Knocking out Dustin Poirier at featherweight (2014): flattened him in under two minutes

dark_possum_3452 on Fighting Floyd Mayweather (2017): An MMA guy took Floyd to round ten and made a fortune. Wild that it even happened.

Conor McGregor's Greatest Moments Tier List: the full ranking

More matchups

• Knocking out Dustin Poirier at featherweight (2014) vs "Sixty G's baby" debut vs Marcus Brimage (2013)
• Knocking out Dustin Poirier at featherweight (2014) vs 40 seconds vs Cowboy Cerrone (2020)
• Knocking out Dustin Poirier at featherweight (2014) vs Losing to Khabib (2018)
• Fighting Floyd Mayweather (2017) vs Beating Nate Diaz in the rematch (2016)
• Fighting Floyd Mayweather (2017) vs "Sixty G's baby" debut vs Marcus Brimage (2013)
• Fighting Floyd Mayweather (2017) vs Interim title vs Chad Mendes (2015)