@HistoryZero26 posed a great question on his thread regarding the Joe Louis scalp on Max Schmeling's record. It was the standout result on Max's record, no doubt. Especially with the historical success Joe went on to have. So, I started to think of others on this question. There has to be many, but 3 off the top of my head are: Marvin Hart - when your next biggest win is over Jack Root, one has to say the win over Jack Johnson was monumental. I know there has been suspicion on if it was on the level but it does sort of take your breath away Vito Antuofermo - I always loved Vito. Held outstanding wins over Hugo Corro, Cyclone Hart, Bennie Briscoe, Emile Griffith, Eckhard Dagge. But that draw with Hagler really wows you when you look at it. Esteban DeJesus - Again, held great wins in his career over Alfonso Frazer, Suzuki, Ray Lampkin, Edwin Viruet, Vicente Mijares. But dropping and beating Roberto Duran was something. Moreso when you look at Duran's record and that he was 72-1 going into his second fight with Leonard. And it will always be asked, who did he lose to before that? Let's hear some more.
Think one of the most obvious ones has to be Buster Douglas. Incredible win over Mike Tyson, also defeated some notable contenders and future/ex champs like Oliver McCall, Trevor Berbick and Greg Page.
Rolando Pascua. He KO'd 30-0 Chiquita Gonzalez in a big upset. Outside of that, he had wins over Rey Paciones & Dodie Boy Penalosa, but nothing even close to approaching the Gonzalez win. Had a career record of 45-25...
When it comes to heavyweights. Gene Tunney and his win over Jack Dempsey. Besides that, he doesn't have much substance at HW, but was for a long time considered Top 10.
Corrie Sanders TKO2 W. Klitschko fits here. Outside of that, Sanders had wins over past it Cooper, Al Cole, and maybe a couple more of similar level.
No mention of Duran's win over Leonard. Buchanan, De Jesus, Palomino, Marcel and Barkley are some very impressive wins, but I doubt anyone would remember Duran differently from someone like Monzon or Ortiz if not for this win.
Frankie Randall getting rid of Chavez 0 . With wins over two former champions Edwin Rosario and Freddie Pendelton
Chu Chu Castillo caught lightning in a bottle when he stopped Ruben Olivares via a TKO 14 to win the bantamweight title due to a bad cut. Olivares was 61-0-1, and he subsequently regained the title in a rematch.
Mike Rossman was a fairly pedestrian tough guy. Beat Victor Galindez up and he became very popular overnight. (Didn’t hurt that he did it on the undercard of Ali-Spinks II with the world watching, including a primetime audience with nearly half the TVs in the USA tuning in). I think he probably wins a rematch but the corrupt WBA allowed Victor to literally refuse to go to the ring with Rossman already inside it and simply say ‘well I guess we will have to do it again when Galindez feels like actually fighting’ and order ANOTHER rematch. In that rematch, Rossman broke his hand and lost. He went from contender to champion to club fighter over the course of that span of three possible fights with Victor, only who of which actually occurred. And you might have noticed the WBA didn’t award a rematch to Rossman when he lost the way they did their favorite son Victor.
The winner for me is Sony Boy Jaro's win over Pongsaklek, that victory was absurd. When they met in 2012, Jaro was a legit straight up journeyman (at best) and Pong took the fight for walking around money, having lost one fight in fifteen years (avenged). Jaro knocked him tf in six. Jaro's next best win? Maybe Along Denoy for one of the minor pan-straps. Along wound up 33-10-4. I have never seen him fight.
Here's a couple of more: Jake LaMotta - held very good wins but if one wanted to be a pessimist, one could denigrate most of his good wins such as Cerdan (tainted with the injured shoulder), Dauthille (last second win of a bout he was losing), Villemain (robbery), Holman Williams (aged), Zivic and Costner (welterweights). Still good wins but the crown jewel was his win over Sugar Ray, who was 40-0 at the time and would go on to have over 120 wins before losing again. Art Hafey - good wins over Alfredo Marcano, Famoso Gomez, Yambito Blanco, Salvador Torres. But they were grade B compared to him going down to Mexico and knocking out Ruben Olivares in 5. Ruben may have been training down in Cantinas but that doesn't change the result and only looks better for Art with the fact that Ruben went on to win the featherweight title twice.