| First | Last | Nickname | Ht. | Wt. | Reach | Stance | W | L | D | Belt |
|---|---|---|---|---|---|---|---|---|---|---|
| Takeshi | Inoue | Lion | 5' 8" | 145 lbs. | -- | 23 | 10 | 0 | ||
| Naoki | Inoue | 5' 9" | 125 lbs. | 71.0" | Orthodox | 11 | 1 | 0 | ||
| Jorge | Interiano | 6' 1" | 205 lbs. | -- | 4 | 3 | 0 | |||
| Jason | Ireland | The Irish Tornado | 5' 9" | 161 lbs. | -- | Southpaw | 19 | 9 | 1 | |
| James | Irvin | The Sandman | 6' 2" | 205 lbs. | 75.0" | Orthodox | 17 | 10 | 0 | |
| Eric | Irvin | 5' 8" | 155 lbs. | -- | 11 | 4 | 0 | |||
| Issa | Isakov | Determinator | 5' 9" | 155 lbs. | 70.0" | Orthodox | 10 | 3 | 0 | |
| Mitsuhiro | Ishida | The Endless Warrior | 5' 6" | 154 lbs. | -- | Southpaw | 20 | 8 | 1 | |
| Teruto | Ishihara | Yashabo | 5' 7" | 135 lbs. | 69.0" | Southpaw | 10 | 7 | 2 | |
| Satoshi | Ishii | 5' 11" | 240 lbs. | -- | Orthodox | 15 | 8 | 1 | ||
| Yuki | Ishikawa | 5' 11" | 205 lbs. | -- | Orthodox | 0 | 2 | 0 | ||
| Eiji | Ishikawa | 5' 10" | 170 lbs. | -- | 29 | 24 | 3 | |||
| Tokimitsu | Ishizawa | Kendo Ka Shin | 6' 0" | 185 lbs. | -- | Orthodox | 1 | 5 | 1 | |
| Damir | Ismagulov | Qazaq | 5' 10" | 155 lbs. | 74.0" | Orthodox | 24 | 3 | 0 | |
| Wallid | Ismail | 5' 7" | 205 lbs. | -- | Orthodox | 9 | 3 | 0 | ||
| Leandro | Issa | Brodinho | 5' 7" | 135 lbs. | 69.0" | Orthodox | 13 | 6 | 0 | |
| Kuya | Ito | Psycho Zombie | 5' 5" | 135 lbs. | 66.0" | Orthodox | 17 | 9 | 1 | |
| Blagoy | Ivanov | Baga | 5' 11" | 250 lbs. | 73.0" | Southpaw | 19 | 6 | 0 | |
| Anthony | Ivy | Aquaman | 6' 2" | 185 lbs. | 74.0" | Orthodox | 8 | 4 | 0 | |
| Tomomi | Iwama | 5' 3" | 155 lbs. | -- | Orthodox | 9 | 6 | 2 | ||
| Tatsuya | Iwasaki | 5' 9" | 205 lbs. | -- | Orthodox | 0 | 1 | 0 | ||
| Taiga | Iwasaki | 6' 1" | 185 lbs. | 73.0" | Orthodox | 9 | 2 | 0 | ||
| Saygid | Izagakhmaev | 6' 0" | 170 lbs. | 74.0" | 22 | 3 | 0 | |||
| Yoislandy | Izquierdo | Cuba | 5' 11" | 155 lbs. | -- | Southpaw | 10 | 4 | 0 |