#1 BJ Penn
BJ Penn last won an MMA fight on November 20, 2010, versus a past his prime, Matt Hughes in the latter's penultimate fight before retiring.
Since that bout, Penn has fought seven times, drawing one and losing his next six in a row.
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It is fair to say that this once great fighter, a UFC Hall of Famer has nothing left in the tank.
Unbelievably, Penn is training for yet another ill-advised comeback and is scheduled to face Ryan Hall at UFC 232 on December 29, 2018. That fight is likely to end the same way as his previous six.
For a fighter who is renowned as one of the greatest Lightweight and Welterweight Champions of all time, these damaging defeats only sully the legacy of the man, whom most fighters declare as their idol.
Penn should retire immediately while he still has a legend to protect.