Featherweight Early career Guerrero is trained by his father Ruben Guerrero, a former
amateur champion, who introduced Robert and his five brothers to boxing as youngsters growing up in
Gilroy, California. After an impressive amateur career begun at a very young age, Robert turned professional, at the age of 18, on May 22, 2001 with a four-round unanimous decision win against Alejandro Cruz. After several wins and only a single draw later, Guerrero won the
WBC NABF Featherweight title against Cesar Figueroa on December 9, 2004. Defending his NABF title twice, Guerrero was seen as a rising prospect, until meeting Gamaliel Diaz in a bout televised on
ShoBox, on the
Showtime channel, on December 12, 2005. An aggressive Diaz upset Guerrero, winning by split decision and taking the NABF belt in the process. Guerrero rebounded from his first loss by defeating Sandros Marcos via third-round technical knock-out, setting up a rematch against Diaz, again on Showtime. Guerrero knocked down Diaz in the first round, and eventually knocking out Diaz early in the sixth round. The win set him up to face IBF champion
Eric Aiken.
Featherweight title In his first world championship fight on September 2, 2006, Guerrero defeated Eric Aiken by an eighth-round technical knockout in
Los Angeles. Guerrero used inside fighting, neutralizing Aiken's power, and eventually making Aiken quit on his stool after the eighth round to earn his first world title belt.
Guerrero vs. Salido Guerrero lost the belt in his next fight in a
mandatory defense to
Orlando Salido in
Las Vegas. Salido dominated the majority of the bout and pulled off an upset decision win with scores of 115–113, 117–111, 118–110. However, Salido would subsequently be stripped of the IBF title after testing positive for steroids, thus vacating the belt; the result of the bout would also be changed to a twelve-round no decision by the Nevada State Athletic Commission. The IBF subsequently gave Guerrero the shot at the vacant featherweight title, which he won by ninth-round technical knockout in
Copenhagen, Denmark on February 23, 2007, against
Albanian boxer Spend Abazi. Guerrero's second defense of his second title was to be against
Rocky Juarez (27–3, 19 KOs); however, Juarez chose to meet WBC Super Featherweight Champion
Juan Manuel Márquez in a money fight instead. Guerrero's first defense was scheduled to be against Martin Honorio (24–3–1) on November 3, 2007, and was televised on Showtime, on the undercard of the Marquez-Juarez match. Guerrero was unable to attend the final press conference before the match after his wife Casey was diagnosed with
leukemia. Guerrero defeated Honorio in a first round knock-out. On February 29, 2008, Guerrero defeated
Jason Litzau via an eighth round knock out. Guerrero then vacated the title to move up in weight.
Super featherweight Guerrero vs. Yordan On March 7, 2009, Guerrero fought
Daud Yordan in his
HBO debut. The fight ended in a second round "no contest" decision after Guerrero suffered a headbutt resulting in a gash above his eye. After the bout Guerrero offered Yordan a rematch, however, Yordan reportedly declined.
Guerrero vs. Hinojosa On June 12, 2009, Guerrero faced Efren Hinojosa (30–5–1). He suffered another deep cut near his left eye from a head-butt in the seventh round, but this time it did not slow his progress as he scored an eighth round
TKO victory. After the bout, the media described him as having redeemed himself for his previous lackluster effort.
Guerrero vs. Klassen On August 22, 2009, Guerrero challenged
Malcolm Klassen for his IBF Super Featherweight title. Guerrero won the fight by a unanimous decision to claim the world title. The scores were 117–112, 116–112 and 115–113 in his favor. In February 2010, Guerrero vacated his Featherweight title in order to care for his ailing wife.
Lightweight Guererro vs. Arrieta On April 30, 2010, Guerrero moved up to the lightweight division to fight Robert Arrieta (35–15–4). The bout took place at the Tropicana Hotel and Casino in Las Vegas, Nevada, United States. Guerrero won the fight by TKO in the 8th round. After the bout, Guerrero expressed his interest in fighting Mexican champion
Juan Manuel Márquez.
Light welterweight Guerrero vs. Casamayor On July 31, 2010, Guerrero moved up to the junior welterweight division and faced
Cuban fighter
Joel Casamayor on the undercard of the
Marquez vs. Diaz pay-per-view at the Mandalay Bay in Las Vegas. Guerrero defeated Casamayor by a 10-round unanimous decision.
Return to lightweight Guerrero vs. Escobedo On November 6, 2010, he faced
Vicente Escobedo for the vacant WBO Inter-Continental lightweight title. Guerrero knocked Escobedo down in the third and sixth rounds en route to a ten-round unanimous decision.
Guerrero vs. Katsidis On April 9, 2011, Guerrero faced
Michael Katsidis for the interim WBA and WBO lightweight titles. Guerrero won the bout with a 12-round unanimous decision. In a post-fight interview when asked about his hometown he said, "It's nice when you're pretty much their biggest thing besides garlic in Gilroy." Guerrero was scheduled to face
Marcos Maidana in August for the WBA junior welterweight title, however, he was forced to pull out of the bout after suffering a torn tendon in his rotator cuff. He underwent surgery to repair the injury and was out of the ring for 6 months.
Welterweight Guerrero vs. Aydin Guerrero returned to the ring by jumping two weight classes to face unbeaten top 10 welterweight
Selcuk Aydin. On July 28, 2012 Guerrero defeated Aydin in
San Jose, California by unanimous decision for the
interim WBC welterweight title.
Guerrero vs. Berto Guerrero's next fight was against former two-time
Welterweight champion
Andre Berto (28–1, 22 KO) at the Citizens Bank Business Arena in
Ontario, California. Guerrero started off the fight fast, sending Berto to the canvas each of the first two rounds, as well as badly closing Berto's right eye early on. Berto got back into the fight during the middle rounds, landing hard uppercuts and right hands on Guerrero, who took the punches well. Throughout the fight the two traded punches with Berto on the ropes and Guerrero smothering him, while out working him the majority of the time. By the end of the fight, both of Berto's eyes and Guerrero's right eye were closed shut. Guerrero won a unanimous decision by the scores of 116–110 on all three scorecards. Guerrero had a purse of $1 million, while Berto's purse was $1.625 million. In the post fight interview, Guerrero called out pound-for-pound champion Floyd Mayweather saying, "Pretty Boy, let's do it."
Guerrero vs. Mayweather On May 4, 2013 in a fight billed as
May Day', Guerrero lost to
Floyd Mayweather Jr. (43–0, 26 KOs) in the
WBC Welterweight Championship fight by a unanimous decision in front of a 15,880 crowd at the
MGM Grand arena, with all judges scoring the fight 117–111 in favor of Mayweather. Guerrero won the first 3 rounds, then Mayweather adjusted back to his defensive style and won from the 4th to 12th round. Mayweather landing a high 60 percent of his power punches, which included 23 of 30 power punches in the eighth round, when Guerrero was cut over his left eye. Throughout the fight, Mayweather landed 195 punches to 113 for Guerrero. Guerrero reportedly earned a career high of $3 million and the fight exceeded 1 million
PPV buys.
Guerrero vs. Kamegai Guerrero took off a full year before returning to the ring on June 21, 2014 to fight Japanese boxer
Yoshihiro Kamegai. Guererro could hardly open his left eye toward the end of the fight, but scored a unanimous 12-round decision over the tough Kamegai with official scores of 116–112, 117–111, and 117–111, thereby marking a triumphant return to the ring.
Guerrero vs. Thurman On March 7, Guerrero fought in
NBC's first episode of their new series, "
Premier Boxing Champions" at the
MGM Grand in
Las Vegas. Guerrero's opponent was undefeated
Keith Thurman. Thurman started off the match as the aggressor, throwing many powerful punches. Guerrero was able to withstand Thurman's blows until he was knocked down in the ninth round. Although the fight seemed bleak for Guerrero he was able to fight back, giving an exciting final three rounds in which he became the aggressor and forced Thurman against the ropes. Ultimately, "The Ghost" lost by unanimous decision but Guerrero's determination and strong will to win had the crowd of the MGM Grand chanting his name for the majority of the final round.
Guerrero vs. Martinez On June 6, 2015 Guerrero fought again on NBC as part of the "Premier Boxing Champions" series at
StubHub Center, California, against the gritty Aron Martinez (19–4–1, 4 KOs). Martinez proved himself to be an underdog with bite. The action got going in earnest in Round 2, with both fighters working the body hard in some grueling infighting. Martinez continued to press the action in Round 4, scoring a knockdown at the end with hard body shots and then combinations to the head. But the momentum of the fight began to swing back in Guerrero's direction in Round 6, when he fought more from the outside. Both fighters had their moments in the latter half of the fight, but it was Guerrero who was able to control the distance, outland Martinez and pull out a split-decision win in a feisty back-and-forth battle.
Guerrero vs. Garcia On January 23, 2016 Guerrero fought on
FOX as part of the "Premier Boxing Champions" series at
Staples Center,
California, against the undefeated
Danny Garcia (31–0–0, 18 KO) for the vacant
WBC Welterweight Championship. The match was ruled a unanimous decision in favor of Garcia with all three judges scoring the bout 116–112, despite fighting on near-equal terms. Guerrero started off impressive, but became less effective late in the fight falling to a 3rd career defeat in a welterweight title fight. Garcia landed 163 of 496 thrown (33%), whilst Guerrero landed 108 of 436 punches thrown (25%).
Guerrero vs. Peralta Guerrero's next fight was announced on July 16, to take place at the
Honda Center in
Anaheim against Argentine boxer David Emanuel Peralta (25–2–1, 14 KOs) on August 27. Guerrero was outboxed, outclassed and beaten by Peralta. The judges decided after 12 rounds Peralta won by split decision, handing Guerrero his 4th loss in his last six fights.
Guerrero vs. Figueroa Jr. On May 23, 2017 it was announced that Guerrero would fight at the renovated
Nassau Coliseum in
Uniondale, New York against undefeated former WBC lightweight champion
Omar Figueroa Jr. (26–0–1, 18 KOs) on July 15, 2017. The bout will take place as part of a triple header main event which would include
Sean Monaghan vs.
Marcus Browne. Before this fight, Figueroa last fought in December 2015. The first boxing event to take place at the Coliseum in 31 years saw Guerrero stopped in the third round in front of a crowd of 7,492. Figueroa dropped Guerrero a total five times before the fight was halted. According to Compubox stats, Figueroa landed 88 of his 185 punches thrown (48%), whilst Guerrero landed 78 of 201 thrown (39%). Guerrero saw success in round 1, but the fight turned around when Figueroa landed a huge left hook knocking Guerrero down and eventually handing him his third consecutive loss. According to
Nielsen Media, the fight peaked at 1,039,000 viewers on Fox. The whole show averaged 886,000 viewers.
Retirement A couple of days following his first stoppage loss, Guerrero announced his retirement from professional boxing after 16 years. Guerrero had been on a decline, since losing to Floyd Mayweather in 2013. He had only won two of his last six fights. Guerrero said in a statement, In the statement, he also thanked advisor
Al Haymon and praised him as "the most special man" he ever met in his boxing career. He ended his career with 33 wins out of 42 fights, including 18 wins coming inside the distance.
Comeback Guerrero vs. Mate On November 8, 2018 Guerrero surprisingly announced he would be returning to the boxing ring, stating he had 'some fight left' and also wanting to further his legacy. According to ESPN, his return bout would take place on December 1 on the
Wilder vs. Fury Showtime PPV card at the
Staples Center in
Los Angeles, California. Guerrero was scheduled to fight 27-year-old Hungarian boxer Adam Mate (28–12, 21 KOs) in a 10-round welterweight bout. For the comeback, Guerrero was guaranteed a $25,000 purse. Fighting for the first time in 16 months, Guerrero knocked out Mate in round 2 of their scheduled 8 round bout. Mate was knocked down once in round 1, taking a knee and twice in round 2. After beating the count for the second knockdown, referee Ray Corona stopped the fight. It was Guerrero's first stoppage win in 13 fights, dating back to April 2010.
Guerrero vs. Herrera In his next fight, Guerrero defeated Hevinson Herera via a fifth round technical knockout.
Guerrero vs. Thomas In his following fight, Guerrero fought Gerald Thomas. Guerrero won the fight via unanimous decision, scoring 99–91, 99–91 and 98–92 on the scorecards.
Guerrero vs. Ortiz On August 21, 2021, Guerrero faced former world champion
Victor Ortiz. In a fight that lacked action at times, all three judges uniformly saw Guerrero as the narrow winner, with all of them scoring it 96–94 in favor of Guerrero. ==Professional boxing record==