Fedor Emelianenko hangs out backstage prior to his (Credit: Strikeforce / Esther Lin)

Fedor Emelianenko hangs out backstage prior to his fight against Antonio Silva in the opening round of the Strikeforce Grand Prix heavyweight tournament in East Rutherford, N.J. (Feb. 12, 2011)

Fedor Emelianenko

Fedor "The Last Emperor" Emelianenko was once considered the world's top-ranked heavyweight MMA fighter during a 10-year, 27-fight win streak.

In this photo made Thursday, June 21, 2012
(Credit: AP Photo Alexei Nikolsky)

In this photo made Thursday, June 21, 2012 Russian President Vladimir Putin, right, shakes hands with heavyweight martial arts fighter Fedor Emelianenko at the M-1 Global mixed martial arts tournament in St. Petersburg, Russia. Fedor Emelianenko announced his retirement after knocking out Brazilian Pedro Rizzo. (AP Photo/RIA-Novosti, Alexei Nikolsky, Presidential Press Service)

Russia's President Vladimir Putin (front R) congratulates heavyweight
(Credit: Getty ALEXEI NIKOLSKY)

Russia's President Vladimir Putin (front R) congratulates heavyweight mixed martial artist Fedor Emelianenko (front L) after watching his fight against Pedro Rizzo entitled "M-1 Global: Fedor vs. Rizzo," at Ice Palace in Saint-Petersburg, late on June 21, 2012. AFP PHOTO / RIA-NOVOSTI / POOL/ ALEXEI NIKOLSKYALEXEI NIKOLSKY/AFP/GettyImages

Russia's Prime Minister Vladimir Putin (R) toasts with
(Credit: Getty/ALEXEY DRUZHININ)

Russia's Prime Minister Vladimir Putin (R) toasts with Mixed Martial Arts champion Fedor Emelianenko during a meeting with his campaign activists in Moscow, on March 5, 2012, the next day after the vote. Putin secured yesterday almost 64 percent of the vote, winning back the presidency which he held for two terms from 2000-2008 before his four-year stint as prime minister. AFP PHOTO/ RIA-NOVOSTI POOL/ ALEXEY DRUZHININ (Photo credit should read ALEXEY DRUZHININ/AFP/Getty Images)

Fedor Emelianenko hangs out backstage prior to his
(Credit: Strikeforce / Esther Lin)

Fedor Emelianenko hangs out backstage prior to his fight against Antonio Silva in the opening round of the Strikeforce Grand Prix heavyweight tournament in East Rutherford, N.J. (Feb. 12, 2011)

Russia's Prime Minister Vladimir Putin, left, congratulates Russian
(Credit: Getty)

Russia's Prime Minister Vladimir Putin, left, congratulates Russian heavyweight fighter Fedor Emelianenko after his victory over Jeff Monson of the US in Moscow. (Nov. 20, 2011)

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Russia's Prime Minister Vladimir Putin, left, shakes hands
(Credit: Getty)

Russia's Prime Minister Vladimir Putin, left, shakes hands with Russian MMA legend Fedor Emelianenko of Russia after his victory over Jeff Monson of the US, in Moscow. (Nov. 20, 2011)

Fedor Emelianenko in the locker room after losing
(Credit: Darren Shuster/Dragon Door/RKC)

Fedor Emelianenko in the locker room after losing by first-round TKO to Dan Henderson at Strikeforce in Hoffman Estates, Ill. (July 30, 2011)

Fedor Emelianenko, left, tries to hit Dan Henderson,
(Credit: AP )

Fedor Emelianenko, left, tries to hit Dan Henderson, right, during their fight at the Sears Centre. (July 30, 2011)

Fedor Emelianenko, left, tries to hit Dan Henderson,
(Credit: AP)

Fedor Emelianenko, left, tries to hit Dan Henderson, right, during their fight at the Sears Centre. (July 30, 2011)

Fedor Emelianenko, left, fights Dan Henderson, right, during
(Credit: AP )

Fedor Emelianenko, left, fights Dan Henderson, right, during their fight at the Sears Centre. (July 30, 2011)

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Fedor Emelianenko, left, tries to push away Dan
(Credit: AP )

Fedor Emelianenko, left, tries to push away Dan Henderson, right during their fight at the Sears Centre. (July 30, 2011)

Fedor Emelianenko, right, is taken down by Dan
(Credit: AP )

Fedor Emelianenko, right, is taken down by Dan Henderson, left, during their fight at the Sears Centre. (July 30, 2011)

That swelling underneath Fedor Emelianenko's right eye caused
(Credit: Strikeforce / Esther Lin)

That swelling underneath Fedor Emelianenko's right eye caused doctors to stop the fight after the second round, giving Antonio Silva the win in the quarterfinal round of the Strikeforce Grand Prix heavyweight tournament. (Feb. 12, 2011)

Fedor Emelianenko, of Russia, is seen with the
(Credit: AP)

Fedor Emelianenko, of Russia, is seen with the eye that forced a stoppage of his bout against Antonio Silva, of Brazil, during a Strikeforce Heavyweight Grand Prix fight at the Izod Center in East Rutherford, N.J. (Feb. 12, 2011)

Fedor Emelianenko's right eye was so swollen, the
(Credit: Newsday / Mario Gonzalez)

Fedor Emelianenko's right eye was so swollen, the doctors stopped the fight after the second round as Antonio Silva won the quarterfinal round of the Strikeforce Grand Prix at the Izod Center in East Rutherford, N.J. (Feb. 12, 2011)

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Fedor Emelianenko, of Russia, is pushed against the
(Credit: AP)

Fedor Emelianenko, of Russia, is pushed against the cage by Antonio Silva, of Brazil, during a Strikeforce Heavyweight Grand Prix fight at the Izod Center in East Rutherford, N.J. Silva won after the end of the second round when the doctor said Emelianenko could no longer see out of his eye. (Feb. 12, 2011)

Fedor Emelianenko, right, of Russia, is taken down
(Credit: AP)

Fedor Emelianenko, right, of Russia, is taken down by Antonio Silva, of Brazil, during a Strikeforce Heavyweight Grand Prix fight at the Izod Center in East Rutherford, N.J. Silva won after the end of the second round when the doctor said Emelianenko could no longer see out of his eye. (Feb. 12, 2011)

Fedor Emelianenko is introduced to the crowd at
(Credit: Newsday / Mario Gonzalez)

Fedor Emelianenko is introduced to the crowd at the Izod Center in East Rutherford, N.J., on the first night of the Strikeforce Grand Prix. He lost to Antonio Silva in the quarterfinal round of the tournament later in the night. (Feb. 12, 2011)

Antonio "Bigfoot" Silva, left, wags his finger to
(Credit: Newsday / Mario Gonzalez)

Antonio "Bigfoot" Silva, left, wags his finger to let people know Fedor Emelianenko's ankle lock is not hurting him at the end of the second round of the quarterfinal bout in the Strikeforce Grand Prix at the Izod Center in East Rutherford, N.J. (Feb. 12, 2011)

Fedor Emelianenko awaits an interview with Gus Johnson
(Credit: Newsday / Mario Gonzalez)

Fedor Emelianenko awaits an interview with Gus Johnson after losing in the quarterfinal round of the Strikeforce Grand Prix at the Izod Center in East Rutherford, N.J. (Feb. 12, 2011)

Fedor Emelianenko, shown here before a Strikeforce fight
(Credit: AP)

Fedor Emelianenko, shown here before a Strikeforce fight against Fabricio Werdum, won 27 straight matches over a 10-year span before losing three in a row starting with Werdum. (June 26, 2010)

Fedor Emelianenko lost by submission in the first
(Credit: Strikeforce)

Fedor Emelianenko lost by submission in the first round to Fabricio Werdum at Strikeforce in San Jose, Calif. (June 26, 2010)

Fedor Emelianenko lost by submission in the first
(Credit: Strikeforce)

Fedor Emelianenko lost by submission in the first round to Fabricio Werdum at Strikeforce in San Jose, Calif. (June 26, 2010)

Fedor Emelianenko lost by submission in the first
(Credit: Strikeforce)

Fedor Emelianenko lost by submission in the first round to Fabricio Werdum at Strikeforce in San Jose, Calif., on June 26, 2010.

Fedor Emelianenko of Russia, top, fights Brett Rogers
(Credit: AP Photo)

Fedor Emelianenko of Russia, top, fights Brett Rogers in the second round of the Strikeforce heavyweight bout at The Sears Centre Arena in Hoffman Estates, Ill., on Nov. 7, 2009. Emelianenko won via second-round knockout.