Question: In what year did Tony Lopez defeat the first boxer to defeat Roger Mayweather?

Context articles: Esteban de Jesús
Jesse Reid
Frankie Randall
Roger Mayweather
Serafim Todorov
Tony Lopez (boxer)
Román González (boxer)
Rocky Lockridge
Tony Baltazar
Boxing career of Manny Pacquiao

Esteban de Jesús (August 2, 1951 – May 12, 1989) was a Puerto Rican world lightweight champion boxer whose life was full of controversy, problems and scandals.
 De Jesús, a native of the town of Carolina, Puerto Rico, was a gymmate of Wilfred Benítez and an acquaintance of Benitez's mother, Clara Benítez.
 He was trained by Wilfredo's father and Clara's husband, Gregorio Benitez.
 He was the first boxer to defeat Roberto Durán as a pro.
Jesse Reid is a boxer and Hall of Fame trainer.
 His former students include world champions Roger Mayweather, Lamon Brewster, Johnny Tapia, Orlando Canizales, Reggie Johnson and Bruce Curry.
 He has trained 23 World Champions and developed over 40 world-rated boxers.
Frankie Billy Randall (born September 25, 1961) is an American former professional boxer who competed from 1983 to 2005.
 He is a three-time light welterweight world champion, having held the WBA, WBC, and lineal titles between 1994 and 1997.
 Randall is best known for being the first boxer to defeat Julio César Chávez, whose record at the time of their 1994 fight stood at 89 wins and a draw.
Roger Mayweather (born April 24, 1961) is an American former professional boxer who competed from 1981 to 1999, and has since worked as a boxing trainer.
 He is a two-weight world champion, having held the WBA and lineal super featherweight titles from 1983 to 1984, and the WBC light welterweight title from 1987 to 1989.
 Additionally he held the IBO light welterweight title in 1994, and the IBO welterweight title from 1994 to 1995.
Serafim Simeonov Todorov (Bulgarian: Серафим Симеонов Тодоров ; born 6 July 1969) is a Bulgarian former amateur boxer.
 He won three consecutive gold medals at both the World and European Championships, and silver at the 1996 Olympics.
 He is the last boxer to defeat Floyd Mayweather Jr., who later went on to become one of the all-time greats in professional boxing.
Tony "The Tiger" Lopez (born February 24, 1963), is a former professional boxer from Sacramento.
 He was a 3-Time World Boxing Champion.
 He is remembered for his victory in the 1988 "The Ring" Fight of the year by decision over Rocky Lockridge.
 He fought against Julio César Chávez in 1994 in Monterrey.
 He lost by TKO.
 Tony Lopez is now retired from boxing and runs a bail bond agency in Sacramento.
Román Alberto González Luna (born June 17, 1987), best known as "Chocolatito" González, is a Nicaraguan professional boxer.
 He is the first boxer from Nicaragua to win world titles in four weight classes, having surpassed his mentor, idol, and former three-weight world champion, the late Alexis Argüello.
 González is also the first boxer in history to win world titles in all four of the lowest weight classes: minimumweight, light flyweight, flyweight, and super flyweight.
Rick "Rocky" Lockridge (born January 30, 1959) is an American former professional boxer.
 He is known for handing Roger Mayweather his first defeat—a first-round knockout in just 98 seconds—earning him the WBA and lineal super featherweight titles.
 He later won the IBF super featherweight title.
Anthony Baltazar (born February 5, 1961) is an American former boxer that competed in the Lightweight division.
 After an amateur career during which he won various titles, he turned professional in the late 1970s, and boxed the likes of Robin Blake, former world champion Roger Mayweather, Hector Macho Camacho and Carlos Bolillo Gonzalez, the last two of which Baltazar fought for world titles.
 Baltazar was a contender at the Lightweight and Jr.
 Welterweight divisions.
In 2016, Manny Pacquiao was ranked number 2 on ESPN's list of top pound-for-pound boxers of the past 25 years.
 He is the only eight-division world champion in the history of the sport, having won eleven major world titles, as well as being the first boxer to win the lineal championship in five different weight classes.
 Pacquiao is also the first boxer in history to win major world titles in four of the original eight weight classes of boxing, also known as the "glamour divisions": flyweight, featherweight, lightweight, and welterweight.