Question: Kelly Robert Pavlik, is an American former professional boxer who competed from 2000 to 2012, he won the unified WBC, WBO, "Ring" magazine and lineal middleweight titles, and made three successful defenses before losing them to Sergio Martínez, in which year, an Argentine former professional boxer who competed from 1997 to 2014?

Context articles: Iván Calderón (boxer)
Donald Curry
Shane Mosley
Marco Antonio Barrera
Jorge Arce
Hasim Rahman
Kelly Pavlik
Jermain Taylor
Andre Ward
Sergio Martínez (boxer)

Iván Calderón Marrero (born January 7, 1975) is a Puerto Rican former professional boxer who competed from 2001 to 2012.
 He is a two-weight world champion, having held the WBO mini flyweight title from 2003 to 2007 (making eleven successful defenses and being recognized as super champion by the organization), and the WBO, " Ring" magazine, and lineal light flyweight titles from 2007 to 2010 (making six successful defenses).
 Additionally, his August 2010 bout against Giovani Segura was named fight of the year by " Ring" magazine.
 As an amateur Calderón represented Puerto Rico in international competitions, including the 2000 Olympics.
Donald Curry (born Donald Sample; September 7, 1961) is an American former professional boxer who competed from 1980 to 1991, and in 1997.
 He held the undisputed welterweight title from 1985 to 1986; the WBC super welterweight title from 1988 to 1989; and challenged once for the IBF and lineal middleweight titles in 1990.
Shane Andre Mosley (born September 7, 1971), often known by his nickname "Sugar" Shane Mosley, is an American former professional boxer who competed from 1993 to 2016.
 He is a four-time world champion in three weight classes, having held the IBF lightweight title; the WBA (Super) and WBC welterweight titles; and the WBA (Super), WBC, and "Ring" magazine light middleweight titles.
 He is also a former lineal champion at welterweight (twice) and light middleweight.
Marco Antonio Barrera Tapia (born January 17, 1974) is a Mexican former professional boxer who competed from 1989 to 2011.
 He is a four-time world champion in three weight classes, having held the WBO junior featherweight title twice between 1995 and 2001, and the unified WBC and IBF super featherweight titles between 2004 to 2007.
 Additionally, he held the IBO featherweight title in 2001, and the "Ring" magazine and lineal featherweight titles between 2001 and 2003.
Jorge Armando Arce Armenta ( ; born July 27, 1979), best known as Jorge Arce, is a Mexican former professional boxer who competed from 1996 to 2014.
 He is a five-time world champion, and the second boxer from Mexico to win world titles in four weight divisions (after Érik Morales, who first achieved the feat two months prior).
 In a storied career, Arce held the WBO light flyweight title from 1998 to 1999; the WBC and lineal light flyweight titles from 2002 to 2004; the WBO super flyweight title in 2010; the WBO junior featherweight title in 2011; and the WBO bantamweight title from 2011 to 2012.
 Additionally he held the WBC interim flyweight title from 2005 to 2006, the WBA interim super flyweight title from 2008 to 2009, and challenged once for the WBC featherweight title in his final fight in 2014.
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.
Kelly Robert Pavlik (born April 5, 1982) is an American former professional boxer who competed from 2000 to 2012.
 He won the unified WBC, WBO, "Ring" magazine and lineal middleweight titles by defeating Jermain Taylor in 2007, and made three successful defenses before losing them to Sergio Martínez in 2010.
Jermain Taylor (born August 11, 1978) is an American former professional boxer who competed from 2001 to 2014.
 He remains the most recent undisputed middleweight champion, having won the WBA (Undisputed), WBC, IBF, WBO, "Ring" magazine, and lineal titles in 2005 by beating Bernard Hopkins, and in doing so ending Hopkins' twelve-year reign as middleweight champion.
 This made Taylor the first boxer in history to claim each title from all four major boxing sanctioning organizations in a single fight (Hopkins had won his world titles separately between 1995 to 2004).
 He has also held the IBF middleweight title twice.
Andre Michael Ward (born February 23, 1984) is an American former professional boxer who competed from 2004 to 2017.
 He retired with an undefeated record and held eight world titles in two weight classes, including the unified WBA (Super), WBC, "Ring" magazine, and lineal super middleweight titles between 2009 and 2015; and the unified WBA (Undisputed), IBF, WBO, and "Ring" light heavyweight titles between 2016 and 2017.
 During his reign as light heavyweight champion, Ward was ranked as the world's best active boxer, pound for pound, by "The Ring" magazine and the Transnational Boxing Rankings Board (TBRB), as well as the world's best active boxer in the division by "The Ring", the TBRB, and BoxRec.
Sergio Gabriel Martínez (born February 21, 1975) is an Argentine former professional boxer who competed from 1997 to 2014.
 He held the unified WBC, WBO, "Ring" magazine, and lineal middleweight titles between 2010 and 2014, making six successful defenses of the latter two titles.
 Martínez's 50-month reign as lineal champion ranks as one of the longest in middleweight history.
 He also fought at light middleweight, where he held the IBO title from 2003 to 2005, and the WBC interim title in 2008 (later elevated to full world champion status the following year).