#4 Shinsuke Nakamura
There is a reason why Shinsuke Nakamura used to be known as The King of Strong Style, due to his hard-hitting abilities in the wrestling ring, which comes from when Nakamura used to be a professional MMA fighter. Nakamura has had 5 matches in the cage as he currently has a 3-1-1 win/loss/no contest record.
His first ever MMA match was during the Inoki Bom-Ba-Ye event on December 31, 2002, when Nakamura tapped out to Daniel Gracie via submission at Round 2 in 2 minutes and 14 seconds. Despite this loss, Nakamura didn't give up as he also had an MMA fight on May 2, 2003, during the NJPW: Ultimate Crush event where he defeated Jan Nortje in Round 2 at 3 minutes and 12 seconds.
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Nakamura's third fight was during the Jungle Fight 1 event on September 13, 2013, against Shane Eitner as he won by submission again at 4 minutes and 29 seconds during Round 1. This fight also took place in Manaus, Brazil.
The Artist has also competed in two MMA fights for K-1 MMA as they both came against Alexey Ignashov. His first fight against Ignashov was ruled as a no contest, whereas Nakamura defeated him in their second fight via submission again in Round 2 at 1 minute and 51 seconds. It's clear to see that Nakamura is a submission specialist when it comes to MMA.