#3 Benson Henderson
The current Bellator performer, Benson Henderson was once one of the UFC's hottest prospects. So lacklustre has Henderson's Bellator run been, it has caused some to forget his largely successful tenure in UFC.
That UFC career began in April 2011 at a memorable UFC 129 event in which Henderson defeated Mark Bocek.
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Henderson would go on to defeat the Lightweight Champion, Frankie Edgar to win the title in a hugely impressive Decision victory.
Henderson defended that belt successfully versus Edgar in a re-match and also overcame dangerous opponents, Nate Diaz and Gilbert Melendez before dropping the title to Anthony Pettis at UFC 164 on August 31, 2013.
It was a staggeringly successful two years in the MMA powerhouse before "Bendo" experienced a dip in fortunes winning just three of his final five bouts inside the Octagon over the next two years.
His UFC career came to an end and he attempted to rebuild his reputation in Bellator to considerably mild success.
It's a shame in 2018 that Henderson's glory days in UFC are largely forgotten.