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Minotauro Nogueira is the former UFC interim heavyweight champion and the first-ever Pride heavyweight champion. He is a legend of the sport in every sense.
He lost the UFC interim heavyweight championship in December 2008 and has alternated wins and losses since then, until now, when he's lost two straight.
He lost the title by knockout to Frank Mir, but then followed it up with the 2009 Fight of the Year against Randy Couture. After the fight against Couture, Nogueira was knocked out in the first round by Cain Velasquez.
Following the Velasquez fight, Nogueira was out for a long time, having surgery on both of his knees. He returned at UFC 134, the UFC's first trip to Brazil in the modern era. Nogueira won his fight there against Brendan Schaub with a first-round knockout.
The next fight saw Frank Mir break Nogueira's arm with a kimura, then 10 months later, Nogueira beat Dave Herman with an armbar.
Nogueira's last two fights saw him get submitted by Fabricio Werdum and then viciously knocked out by Roy Nelson.
To break it down simply, Nogueira is 3-5 in his past eight, has been finished in every loss and had never been finished before this streak. Also, the only people he's beaten are Randy Couture, Brendan Schaub and Dave Herman.
I'm not saying Nogueira has to retire if he loses in his next fight, but if it's as bad as the loss to Nelson, he should.