Alexander "Alex" de Jesús (February 2, 1983 – April 3, 2016) was a Puerto Rican professional boxer.
 As an amateur, de Jesús represented the island of Puerto Rico in international events, including the 2003 Pan American Games, the 2002 Central American and Caribbean Games and the 2004 Summer Olympics.
 Early in his career, he won seven regional titles: the World Boxing Organization Latino lightweight title, World Boxing Council Caribbean Boxing Federation lightweight title, World Boxing Association Fedecaribe Lightweight title, WBO Latino light welterweight title, WBA Fedecaribe Welterweight title, WBC Latino light welterweight title and the WBA Fedebol light welterweight title.
John Watson (Born 9 June 1983) is a British lightweight boxer, based in Liverpool, Merseyside, United Kingdom.
 He has fought for the British lightweight title on two occasions, losing to Gavin Rees and Anthony Crolla.
William "Billy" 'The Kid' Irwin ( (1968--) 20 1968 (age (2017)-(1968)-((11)<(05)or(11)==(05)and(29)<(20)) ) ) born Niagara Falls, Ontario, is a retired Canadian amateur lightweight and professional light/light welter/welterweight boxer of the 1990s and 2000s who as an amateur won a bronze medal in the Boxing at the 1991 Pan American Games in Havana, Cuba, losing to eventual silver medal winner Patrice Brooks of the United States, represented Canada at the 1991 World Amateur Boxing Championships in Sydney, Australia losing to Julien Lorcy of France, and represented Canada at the 1992 Summer Olympics in Barcelona, Spain, he was stopped in the second round of the lightweight division (– 60 kg) by Ronald Chavez of the Philippines, and as a professional won the Canadian Professional Boxing Council (CPBC) lightweight title, Canada lightweight title, International Boxing Organization (IBO) lightweight title, World Boxing Council (WBC) Continental Americas lightweight title, and Commonwealth lightweight title, and was a challenger for the International Boxing Federation (IBF) lightweight title against Paul Spadafora, and World Boxing Association (WBA) World lightweight title against Juan Díaz, his professional fighting weight varied from 133+1/2 lb , i.e. lightweight to 142 lb , i.e. welterweight.
 He retired from boxing after losing to Juan Diaz in 2005, his second unsuccessful world title challenge.
 His final record was 42(30)–6–0.
Carl Crook (born 10 November 1963 in Bolton) is an English amateur lightweight and professional light/light welterweight boxer of the 1980s and 1990s, who as an amateur was runner-up in the 1985 Amateur Boxing Association of England (ABAE) lightweight title, against Edmond McAuley (Hogarth ABC), boxing out of Chorley ABC, and as a professional won the British Boxing Board of Control (BBBofC) Central Area lightweight title, BBBofC British lightweight title, and Commonwealth lightweight title, and was a challenger for the EBU (European) lightweight title against Antonio Renzo, and Jean Baptiste Mendy, his professional fighting weight varied from 132 lb , i.e. lightweight to 137 lb , i.e. light welterweight.
Anthony Crolla (born 16 November 1986) is a British professional boxer.
 He held the WBA lightweight title from 2015 to 2016, and the British lightweight title from 2011 to 2012.
Ismael Jose Barroso Bernay (born 27 January 1983), best known as Ismael Barroso, is a Venezuelan professional boxer who won the vacant WBA interim lightweight title in 2015, and challenged for the WBA lightweight title in 2016.
Mzonke Fana (born 29 October 1973 in Cape Town, South Africa) is a professional boxer in the junior lightweight (130 lb) division.
 Known as ""The Rose of Khayelitsha"", he was a virtual unknown in the boxing world until he challenged and defeated Malcolm Klassen for the IBF World Junior lightweight title in 2007.
 Prior to the victory, he was knocked out on 9 April 2005 by Marco Antonio Barrera in the second round for the WBC championship.
 He fought Paulus Moses for the WBO international lightweight title, but the fight stopped in the 4th round.
 On 7 December 2013 he fought upcoming fighter Edis Tatli for the WBA Inter-continental lightweight title at the Barona Areena in Espoo, Finland, but lost a decision.
Hector Thompson (born 24 June 1949 in Kempsey, New South Wales) is an Australian professional light/light welter/welter/light middleweight boxer of the 1970s and '80s who won the New South Wales (Australia) State lightweight title, Australian light welterweight title, Australasian lightweight title, Australasian light welterweight title, South Pacific welterweight title, and Commonwealth light welterweight title (three times), and was a challenger for the World Boxing Association (WBA) World lightweight title against Roberto Durán, and World Boxing Association (WBA) World light welterweight title against Antonio Cervantes, his professional fighting weight varied from 132 lb , i.e. lightweight to 152 lb , i.e. light middleweight.
 He was inducted into the Australian National Boxing Hall of Fame in 2005.
John Murray (born 20 December 1984) is a British former professional boxer who competed from 2003 to 2014.
 He held the English lightweight title from 2007 to 2008; the British lightweight title twice, from 2008 to 2010; and the European lightweight title from 2010 to 2011.
 He also challenged once for the vacant WBA lightweight title in 2011.
 John is the brother of British former Olympian Joe Murray.
 Since retiring, Murray has opened his own gym – Murray Machines Gymnasium – in Reddish, where he trains both amateur and professional boxers.
Edis Tatli (born 13 August 1987) is a Finnish professional boxer.
 He held the European Union lightweight title from 2012 to 2013, the European lightweight title from 2015 to 2017, and has challenged once for the WBA lightweight title in 2014.

Question: When did the professional boxer who John Watson lost to hold the WBA lightweight title?
Answer: 2015 to 2016