UFC 22: Only One Can be Champion was a mixed martial arts event held by the Ultimate Fighting Championship on September 24, 1999 at the Lake Charles Civic Center in Lake Charles, Louisiana.

UFC Japan: Ultimate Japan (aka UFC 15.5) was a mixed martial arts event held by the Ultimate Fighting Championship on December 21, 1997, in Yokohama, Japan. The event was seen on pay per view in the United States, on cable TV in Japan, and was later released on home video. It featured a four-man heavyweight tournament, the first ever UFC Middleweight Championship bout, a Heavyweight Championship bout, a Superfight and was the first UFC appearance of MMA legends Kazushi Sakuraba and Frank Shamrock. It was the first event to be located in a country other than the United States or its territories.

Tank Abbott vs Steve Nelmark • Brad Kohler vs Steve Judson • Jens Pulver vs John Lewis • BJ Penn vs Kaoru Uno • Tony de Souza vs Jutaro Nakao • Pat Miletich vs Shonie Carter • Gary Goodridge vs Paul Herrera ; Bobby Hoffman vs M. Robinson • Pedro Rizzo vs Tank Abbott • Fabiano Iha vs Kaoru Uno • Frank Shamrock vs Igor Zinoviev • Pedro Rizzo vs Tra tellingman • Shonie Carter vs Matt Serra • Lance Gibson vs Jermaine André • Chuck Liddell vs K. Randleman • Ron Waterman vs Andre Roberts • Eugene Jackson vs K.Yamamiya • Carlos Newton vs Matt Hughes • Vitor Belfort vs Wanderlei Silva • Pedro Rizzo vs Josh Barnett • Eugene Jackson vs Royce Alger • Pete Williams vs Mark Coleman • Tito Ortiz vs Evan Tanner