Question:  Malik Scott holds a notable win over a Samoan australian boxer who lost a fight against Wladimir Klitschko by knockout in which round?

Context paragraphs:
Chris Byrd: Christopher Cornelius "Chris" Byrd (born August 15, 1970) is an American former professional boxer who competed from 1993 to 2009.  He is a two-time world heavyweight champion, having first won the WBO title in 2000 after an upset corner stoppage over then-undefeated Vitali Klitschko.  In his first title defense later that year, he lost to Vitali's brother Wladimir Klitschko.  In 2002, Byrd defeated Evander Holyfield to win the IBF heavyweight title for his second reign as world champion.  He made four successful defenses until losing his title again to Wladimir Klitschko in a 2006 rematch.  Byrd's cousin, Lamon Brewster, has a shared history with Wladimir Klitschko: Brewster defeated him in 2004, but lost in a 2007 rematch.

Lamon Brewster: Lamon Tajuan Brewster (born June 5, 1973) is an American former professional boxer who competed from 1996 to 2010.  He held the WBO heavyweight title from 2004 to 2006, and is best known for scoring an upset knockout victory over Wladimir Klitschko to win the vacant title.  As an amateur, Brewster won the U.S. national championships in 1995, and a silver medal at that year's Pan American Games, both in the heavyweight division.  Following his retirement from the sport in 2011, he became an entrepreneur and founded a consulting business.

Anthony Joshua vs. Wladimir Klitschko: Anthony Joshua vs. Wladimir Klitschko was a professional boxing match contested between Anthony Joshua and Wladimir Klitschko.  The event took place on 29 April 2017 at Wembley Stadium in London, England, with Joshua's IBF and the vacant WBA (Super) and IBO heavyweight titles on the line.  Joshua won the match via technical knockout in the 11th round.  Klitschko announced his retirement from boxing a few months after the fight.

Klitschko brothers: Vitali Klitschko (born 19 July 1971) and Wladimir Klitschko (born 25 March 1976), collectively known as the Klitschko brothers are Ukrainian heavyweight boxers.  During their peak years from 2004 until 2015, the Klitschko brothers were considered the most dominant heavyweight champions of their era, and amongst the most successful champions in boxing history.  After the retirement of boxing legend Lennox Lewis, the Klitschko brothers held all heavyweight boxing world titles.  Known for their exceptionally large frames and robotic boxing styles, the Klitschko brothers developed a style that utilized their athleticism and using their reach to break down opponents.

Corrie Sanders: Cornelius Johannes "Corrie" Sanders (7 January 1966 – 23 September 2012) was a South African professional boxer who competed from 1989 to 2008.  He won the WBO heavyweight title in 2003 after stopping Wladimir Klitschko in two rounds, which was considered one of the biggest upsets in heavyweight boxing history; "The Ring" magazine named it the Upset of the Year.  In 2004, having vacated the WBO title, Sanders faced Wladimir's brother Vitali Klitschko in an unsuccessful challenge for the vacant WBC and "Ring" heavyweight titles.

Malik Scott: Dohonna Malik Scott (born October 16, 1980) is an American professional boxer, known as "King" or "The Noble Artist".  He holds notable wins over former world heavyweight title challengers Alex Leapai and Tony Thompson.

Alex Leapai: Elise "Alex" Leapai (born 16 October 1979) is a Samoan Australian former professional boxer.  His career highlight was a fight against Wladimir Klitschko in 2014, for the WBA (Super), IBF, WBO, IBO, "The Ring" magazine and lineal heavyweight titles.  Leapai lost by knockout in the fifth round.

Wladimir Klitschko vs. Tyson Fury: Wladimir Klitschko vs. Tyson Fury, billed as "Kollisionskurs" (German for "Collision Course"), was a professional boxing match contested for the WBA (Super), WBO, IBF, IBO, "The Ring" magazine, and lineal heavyweight titles.  The fight took place on November 28, 2015 at Esprit Arena, Düsseldorf, Nordrhein-Westfalen, Germany.  Fury was declared the winner by unanimous decision.  This ended Klitschko's reign of nearly 10 years, the second longest in heavyweight history.  Klitschko is entitled to a rematch per the fight contract.  Despite this, Fury was stripped of the IBF heavyweight title for agreeing to the rematch instead of facing the IBF mandatory challenger, Vyacheslav Glazkov.

Tyson Fury: Tyson Luke Fury (born 12 August 1988) is a British professional boxer.  He has held the "Ring" magazine heavyweight title since 2015, after defeating long-reigning world champion Wladimir Klitschko.  In the same fight, Fury also won the unified WBA (Super), IBF, WBO, IBO and lineal titles, with the victory earning him Fighter of the Year and Upset of the Year awards by "The Ring".  Fury was subsequently stripped of the IBF title later that year for being unable to grant a fight against their mandatory challenger, Vyacheslav Glazkov, due to agreeing to a rematch with Klitschko.  In 2016, Fury vacated the WBA, WBO, IBO, and lineal titles following an ongoing medical investigation and personal issues and two cancellations of the Klitschko rematch.  In August 2016, Fury was ranked by BoxRec as the world's sixth best active boxer, pound for pound.

Wladimir Klitschko vs. David Haye: Wladimir Klitschko vs. David Haye was a heavyweight unification fight for the WBA (Super), WBO, IBF, IBO and The Ring heavyweight titles.  The fight took place in Imtech Arena, Altona, Hamburg, Germany on July 2, 2011.  Klitschko won with a unanimous points victory.  The fight reached a global television audience of 500 million viewers in 150 countries.

Supporting paragraphs: Malik Scott Alex Leapai
Answer: fifth round