| Greatest Nine | |
| Platforms: | Sega Saturn, Game Boy Advance |
| Developer: | Sega CS1 Lab |
| Publisher: | Sega |
| Genre: | Sports |
| First Release Version: | Kanzen Chūkei Pro Yakyū Greatest Nine |
| Latest Release Version: | Baseball Advance |
| Latest Release Date: | 2002 |
Greatest Nine is a series of baseball-themed sports video games developed by Sega CS and published by Sega. It began with the 1995 game Kanzen Chūkei Pro Yakyū Greatest Nine for the Sega Saturn. Its most recent entry is Baseball Advance (2002).
Six entries were released for the Sega Saturn between 1995 and 1998. It was later revived in 2002 on the Game Boy Advance (GBA). This version was developed by Smilebit (absorbed by Sega in 2004), also responsible for Motto Pro Yakyuu Team o Tsukurou!.
Kanzen Chūkei Pro Yakyū Greatest Nine was developed to be fully licensed by Major League Baseball when released to the American market. Next Generation reviewed the Saturn version of the game, rating it four stars out of five, and stated that "In the end, minus a few malfunctioning control features that Sega US promises to fix, Greatest Nine is an excellent sports title for the Saturn and an extremely encouraging sign of what's to come."[1]
A version of Greatest Nine was released for the Game Boy Advance in 2002, under the name Baseball Advance.