Mike Tyson vs. Danny Williams, billed as "Return for Revenge", was a professional boxing match contested on July 30, 2004.
 Although former heavyweight champion Tyson entered the fray as a 9-to-1 favorite with oddsmakers, the fight was won by Williams by knock out at 2:51 of the 4th round.
Mike Tyson vs. Michael Spinks was a boxing match which took place on Monday June 27, 1988.
 Both men were undefeated and each had a claim to being the legitimate heavyweight champion.
 At the time, Tyson held the belts of all three of the major sanctioning organizations (World Boxing Council, World Boxing Association, and International Boxing Federation) while Spinks was the "Ring" champion and was considered the lineal champion.
Mike Tyson vs. Buster Douglas, billed as "Tyson Is Back!"
, was a historic boxing match that occurred at the Tokyo Dome in Tokyo, Japan on February 11, 1990, in which then undefeated, undisputed heavyweight champion Mike Tyson lost via knockout to the 42–1 underdog Buster Douglas.
 The fight is widely considered one of the biggest upsets in sports history.
Mike Tyson vs. Evander Holyfield, billed as "Finally", was a professional boxing match fought between Evander Holyfield and Mike Tyson for the World Boxing Association heavyweight championship on November 9, 1996 at the MGM Grand Garden Arena in Paradise, Nevada.
 The bout was Tyson's first defense of the WBA title that he had won from Bruce Seldon on September 7 of that year.
Mike Tyson vs. Lou Savarese, billed as "Tyson's Back", was a professional boxing match contested on June 24, 2000.
Mike Tyson vs. Brian Nielsen was a professional boxing match contested on October 13, 2001.
Brian Nielsen (born 1 April 1965) is a Danish former professional boxer who held the IBO heavyweight title.
Sparring with Hemingway is a book written by Budd Schulberg consisting of a collection of Schulberg's articles on boxing spanning nearly half a century.
 The book includes descriptions of fights between Marciano and Archie Moore; Ali and Foreman; Leonard and Duran; and Hagler and Hearns.
 A review of the book in the "New York Times" praises Schulberg's technical expertise on the subject of boxing.
 A "Chicago Tribune" review of the book states: The pieces in the present volume range over the whole of Schulberg's career and include those drawn from his days as a reporter for the New York Post as well as assignments for Sports Illustrated and other publications.
 He chronicles the demise of Archie Moore, the implacable assaults of Rocky Marciano, the supernova-like appearance of Cassius Clay and his psych job on the theretofore-invincible Sonny Liston, the saga of Mike Tyson (predicting long before Tyson's conviction on rape charges that "the biggest fight of all may still be Tyson vs. Tyson") and the resurrection of George Foreman: "Win or lose, this 260 pounds of fighting preacher has proved what . . . F. Scott Fitzgerald denied when he wrote, `There are no second acts in American lives.' "
Mogens Palle (born 14 March 1934) is a Danish professional boxing promoter and manager.
 He was involved in more than 200 matches for European and world titles and worked with Ayub Kalule, Tom Bogs, Jimmy Bredahl, Thomas Damgaard, Brian Nielsen, Chris Christensen, Jørgen Hansen, Steffen Tangstad and Mikkel Kessler, among other boxers.
 In the mid-1960s he was the European manager of Sonny Liston, and in 2001 organized the match between Mike Tyson and Brian Nielsen in Denmark.
 He also brought to Denmark boxing stars like Carlos Monzon, Larry Holmes, Emile Griffith, Ken Buchanan and John Conteh.
 During his career he worked together with his father Thorkild and daughter Bettina.
 In 2008 he was inducted into the International Boxing Hall of Fame.
Mike Tyson vs. Peter McNeeley, billed as "He's Back", was a professional boxing match contested on August 19, 1995.
 The match marked the return of Mike Tyson to professional boxing after over four years away due to his 1991 arrest and subsequent conviction for rape in 1992 which led to Tyson serving three years in prison.

Question: In Mike Tyson vs. Brian Nielsen, who was Danish?
Answer: Brian Nielsen