Question: When was the Polish professional boxer over which Joe Smith Jr. rose to prominence in 2016 by scoring an upset knockout victory born? 

Context articles: Don Kent (wrestler)
Glen Johnson (boxer)
Ray Mercer
Ron Stander
Andrzej Fonfara
Joe Smith Jr.
Danny Williams (boxer)
Hasim Rahman
Lamon Brewster
Oliver McCall

Leo Joseph "Joe" Smith Jr. (June 24, 1933 – June 7, 1993) was an American professional wrestler who wrestled as Don Kent and also as The Black Dragon, Doug Kent, Joe Smith and Super Medico III during his 20 years in professional wrestling.
Glengoffe Donovan "Glen" Johnson (born 2 January 1969) is a Jamaican professional boxer.
 A veteran of the sport for more than twenty years, he held the IBF light heavyweight title in 2004; and the IBO and "Ring" magazine light heavyweight titles from 2004 to 2005.
 Johnson is best known for his upset knockout victory over Roy Jones Jr. in 2004, as well as his iron chin and relentless pressure fighting style.
Raymond Anthony "Ray" Mercer (born April 4, 1961) is an American former professional boxer, kickboxer, and mixed martial artist.
 In boxing he competed from 1989 to 2008, and held the WBO heavyweight title from 1991 to 1992.
 As an amateur he won a gold medal in the heavyweight division at the 1988 Summer Olympics.
 As a mixed martial artist, Mercer is known for scoring an upset one-punch knockout victory over former UFC heavyweight champion Tim Sylvia in 2009.
Ron Stander (born October 17, 1944) is a former professional boxer, who fought from 1969 to 1982.
 He challenged for the world heavyweight championship in 1972, losing to Joe Frazier by fifth round technical knockout.
 He scored a fifth round knockout victory over hard-punching Earnie Shavers in 1970, and a points decision win over contender Thad Spencer in 1971.
 An award-winning documentary entitled "The Bluffs Butcher," after his adopted hometown of Council Bluffs, IA, produced by journalism student Andrew Batt was released in 2004.
 The documentary told the story of Iowa's arguably best shot at a World Heavyweight Boxing Title and chronicled Stander's journey from virtual unknown to boxing's largest stage.
Andrzej Fonfara (born 4 November 1987) is a Polish professional boxer who held the IBO light heavyweight title from 2012 to 2013.
 He currently resides in Chicago, the city with the third largest Polish population in the world behind Warsaw and New York City.
Joe Smith Jr. (born September 20, 1989) is an American professional boxer who held the regional WBC International light heavyweight title from 2016 to 2017.
 He rose to prominence in 2016 by scoring an upset knockout victory over Andrzej Fonfara, and later becoming the first boxer to score a stoppage victory over former world champion Bernard Hopkins, who retired after their fight.
Daniel Peter "Danny" Williams (born 13 July 1973) is a British professional boxer.
 A veteran of the sport since 1995, he held the British heavyweight title twice between 2000 and 2010, and the Commonwealth heavyweight title twice between 1999 and 2006.
 Williams is best known for scoring an upset knockout victory against Mike Tyson in 2004, which earned him a mandatory WBC heavyweight title opportunity.
 In the same year, he challenged then-reigning champion Vitali Klitschko, but was stopped in eight rounds.
Hasim Sharif Rahman (born November 7, 1972) is an American former professional boxer who competed from 1994 to 2014.
 He is a two-time world heavyweight champion, having held the unified WBC, IBF, IBO, and lineal titles in 2001; and the WBC title again from 2005 to 2006.
 Rahman first became known on the world stage in 2001 when he scored an upset knockout victory against Lennox Lewis to win the unified heavyweight championship.
 Lewis avenged the loss and regained his championship by knocking out Rahman in a rematch later that year.
 Rahman won the WBC title (initially the interim version) for a second time in 2005 by defeating Monte Barrett, after which the WBC elevated him to full champion status by the year's end.
 His reign as champion ended in 2006 via another knockout loss, this time to Oleg Maskaev in a rematch of their first fight in 1999.
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.
Oliver McCall (born April 21, 1965) is an American professional boxer.
 He is best known for winning the WBC heavyweight title in 1994, after scoring an upset knockout victory over Lennox Lewis.
 The next year, he defended the title against Larry Holmes before losing it to Frank Bruno.
 McCall would also become known for an in-ring meltdown during his 1997 rematch with Lewis.