ANSWER: Here's a list of the last scheduled 15 Rounders.
Last 15 Round Championship Bout
June 7, 1997
Convention Center, Ruidoso, New Mexico
Commission: New Mexico Athletic Commission
Promoter: Mike Saccar
Middleweight
Jose Alfredo Flores 156 W Eric Holland 155 SD 15-15
Judge: Jim Ashe
WBB Middleweight Title December 28, 1993
Ritz Carlton, Aspen, Colorado
Super Middleweight
Vinny Pazienza 165 W Dan Sherry 164 KO 11-15
IBO Super Middleweight Title
December 28, 1993
Ritz Carlton, Aspen, Colorado
Lightweight
Anthony Boyle 138 W Chuck Sturm MD 139 KO 11-15
IBO Lightweight Title
August 27, 1990 - The last 15 round non-title bout
Park Plaza Hotel, Tulsa, Oklahoma
Welterweight
Buck Smith 146 NC Harold Brazier 141 ND 15-15
August 29, 1988
Rajadamnern Stadium, Bangkok
Minimumweight
Samuth Sithnaruepol 105 W In-Kyu Hwang 103½ UD 15-15
Referee: John Wheeler | Judge: Rey Cementina 147-144 | Judge: Leon Johannes 146-142 | Judge: Niphon Larhula 146-144
IBF Minimumweight Title
The last 15-round IBF world title bout
August 4, 1988
Plaza de Toros Calafia, Mexicali, Baja California
Promoter: Ignacio Huizar
Featherweight
Jorge Paez 125¾ W Calvin Grove 125½ MD 15- 15
IBF Featherweight Title
Referee: Al Rothenberg | Judge: Jim Traylor 142-142 | Judge: Dave McCullough 143-140 Judge: Robert González 142-140
Chat with our AI personalities
the last scheduled 15 round title fight was probably tony tucker vs buster Douglas for tha vacant ibf title in may '87
the last full 15 round heavyweight title fight was Tim witherspoon beating tony tubbs on the 17 January 1986 by majority decision for the wba title
the last full 15 rounder was probably barry mc guigan vs eusebio pedroza for the featherweight title in 1985.
the last scheduled 15 rounder was probably terry marsh vs akio kemada for the ibf jr welterweight title in July 87.
boxrec.com wrongly states that the frank tate vs tony sibson fight for the ibf middleweight title in february '88 was a 15 rounder. in fact even though the ibf still had 15 rounders in those days, the british boxing board of control wouldn't allow the fight to go any more than 12 rounds.
hope this helps.