[1] He held notable victories in his career over Stefan Leko, Gary Goodridge, Mighty Mo, Carter Williams, Paul Slowinski, Freddy Kemayo and Anderson Silva.

He made his K-1 debut on April 5, 2007, at K-1 Fighting Network Romania 2007 against Stefan Leko.,[6] and was handed the first defeat of his career by the German veteran as he lost via unanimous decision.

In the quarter-finals at the K-1 World Grand Prix 2008 in Amsterdam on April 26, Moroșanu was knocked out with a knee strike by Frenchman Freddy Kemayo just seconds into the opening round.

Following a first-round knock out of Junichi Sawayashiki at the K-1 World Grand Prix 2008 in Taipei on July 13, Moroșanu rematched Kemayo on November 6 at Local Kombat 31 in Buzău, Romania.

He ended the year by defeating Trinidadian brawler Gary Goodridge in a match for the WKN Intercontinental Heavyweight Championship at Local Kombat 32 on December 12.

His KO wins then earned him a chance to compete in a superfight at the K-1 World Grand Prix 2009 in Seoul Final 16 on September 26, where he faced Japanese karate fighter Taiei Kin in a highly-controversial bout.

Moroșanu seemed to think the sound indicative of the ending of the round, and began walking towards his corner, only to be met by a punch from Kin (who was rightfully continuing in the context of the official rules regarding the fight).

Moroșanu deliberately continued to fight, hitting Taiei (who was defenseless after dropping his hands at the end of the round) with a two punch flurry, knocking him unconscious.

On February 6, Moroșanu defeated Deutsch Pu'u via technical knockout in the first round at the K-1 ColliZion MAX 2010 Europe GP in Budapest, Hungary.

On November 27, he rematched Gary Goodridge at K-1 Scandinavia Rumble of the Kings 2010 in Stockholm, Sweden and was able to better "Big Daddy" once again as he won via TKO (referee stoppage) in the second round.

[13] On June 16 at the SuperKombat World Grand Prix II 2011 in Constanța, Romania, he took revenge over Stefan Leko, the man who handed him his first career loss, winning by unanimous decision.

In the semi-finals, he knocked out Utley Meriana with a high kick in the second round, and in the final, he took a clear-cut unanimous decision win over Anderson "Braddock" Silva.

[21] He beat Carter Williams by unanimous decision on November 10, 2012, in Craiova, Romania in a non-tournament at the SuperKombat World Grand Prix 2012 Final Elimination.

[30][31][32] He scored a brutal first-round KO over Daniel Lentie the SuperKombat World Grand Prix 2013 Final Elimination in Ploiești, Romania on November 9, 2013.

He stated that his motivation and financial winnings would go to support a young widow, who wanted to make her daughter's life easier, and filled with the happiness that she deserved but had lost with the death of her father.