how about julio cesar chavez' 90 fight win streak to start a career? say what you want but that's pretty impressive. also, his all-time best of 27 successful title defenses overall.

pacquiao's eight division world titles is probably going to stand the test of time and might not be broken for many decades, if ever.

ultimately, i believe most records will be broken with the exception of those early boxers who had like 250-300 fights. that will never be duplicated again.