 Sylvester Stallone said in an interview : " During [ the filming of ] Rocky IV , Dolph had hit me so hard I had swelling around the heart and had to stay in intensive care at St. John 's Hospital for four days . " Lundgren later fought in a real boxing match against former UFC fighter Oleg Taktarov , and lost via decision . Lundgren has highlighted the premiere of Rocky IV at Westwood Movie Theatre as the moment which changed his life , remarking , " I walked in to a Westwood movie theater as Grace Jones ' boyfriend and walked out ninety minutes later as the movie star Dolph Lundgren . I was shell @-@ shocked for years from the mind @-@ boggling and daunting experience of being a student @-@ athlete from tiny Sweden suddenly having to live up a new action @-@ star persona . " 
