September 28th seems likely to be a controversial date due to boxrec which gives some contradicting information for the day. For sake ease we'll explain this in a moment with out first bout.
The controversial bout took place in 1968 in Los Angeles as Japan's Shozo Saijo successfully claimed the WBA Featherweight title with an excellent 15 round decision win over Raul Rojas. The bout was the second meeting between the two men with Saijo having beaten Rojas in a non-title bout 3 months earlier. This time around Rojas's had his title on the line and was clearly beaten by the talented Japanese fighter who would continue to hold the title until 1971 when he was stopped by Antonio Gomez and decided to retire having had an excellent and thoroughly under-rated career. Now the controversial part, this bout appears to have taken place on September 27th US time but September 28th Japanese time, where Saijo is from. With that in mind we've included it though under-stand why other may not have wanted it including.
In 1996 Thailand's great Ratanapol Sor Vorapin successfully defended the IBF Minimumweight title with a 5th KO over Oscar Andrade. Andrade had been dropped several times before being finished off with a cracking shot that allowed the Thai to record the second defence of his second reign. The Thai had been stripped temporarily for failign to make weight though had re-won the title almost immediately. Ratanapol would retain the title until December 1997 when he was finally dethroned by Zolani Petelo and forced to move up in weight.
The most recent bout of note on this day came in 2004 when Filipino Donnie Nietes suffered his first, and so far only, loss. The loss came in Indonesia as Nietes went and fought the well over-weight Angky Angkotta and lost by controversial split decision. Since this loss Nietes has gone an impressive 10 years and 26 fights with out a defeat as he's risen to become one of the stars of Filipino boxing and a 2-weight world. Nietes might not be on the level of Manny Pacquiao or Nonito Donaire but he's amongst the most impressive Filipino fighters in the sport.
(Image, of Nietes, courtesy of boxrec.com)