| First | Last | Nickname | Ht. | Wt. | Reach | Stance | W | L | D | Belt |
|---|---|---|---|---|---|---|---|---|---|---|
| Top Noi | Kiwram | 5' 5" | 125 lbs. | 67.0" | Southpaw | 9 | 5 | 0 | ||
| Ludovit | Klein | Mr. Highlight | 5' 7" | 155 lbs. | 72.0" | Southpaw | 23 | 4 | 1 | |
| Nick | Klein | Blue Collar | 6' 1" | 185 lbs. | 77.0" | Orthodox | 6 | 1 | 0 | |
| Seth | Kleinbeck | Mass Destruction | 6' 2" | 185 lbs. | -- | 8 | 4 | 0 | ||
| Stefan | Klever | -- | 185 lbs. | -- | Orthodox | 6 | 1 | 0 | ||
| Fatima | Kline | The Archangel | 5' 6" | 115 lbs. | 67.0" | Orthodox | 6 | 1 | 0 | |
| Felix | Klinkhammer | 6' 0" | 170 lbs. | -- | 7 | 0 | 0 | |||
| Drakkar | Klose | 5' 9" | 155 lbs. | 70.0" | Orthodox | 15 | 3 | 1 | ||
| Michael | Knaap | Hammer | 6' 2" | 220 lbs. | -- | Orthodox | 18 | 22 | 3 | |
| Kevin | Knabjian | 5' 10" | 170 lbs. | -- | Orthodox | 12 | 7 | 1 | ||
| Jason | Knight | The Kid | 5' 10" | 145 lbs. | 71.0" | Orthodox | 20 | 5 | 0 | |
| William | Knight | Knightmare | 5' 10" | 205 lbs. | 73.0" | Orthodox | 11 | 5 | 0 | |
| Josefine | Knutsson | Thunder | 5' 3" | 115 lbs. | 60.0" | Orthodox | 8 | 1 | 0 | |
| Seokhyeon | Ko | The Korean Tyson | 5' 10" | 170 lbs. | 71.0" | Southpaw | 11 | 2 | 0 | |
| Isao | Kobayashi | 5' 8" | 145 lbs. | -- | 21 | 4 | 4 | |||
| Kelly | Kobold | Blood Red | 5' 6" | 135 lbs. | -- | Orthodox | 19 | 3 | 1 | |
| Erik | Koch | Phoenix | 5' 10" | 170 lbs. | 71.0" | Southpaw | 16 | 6 | 0 | |
| Sokun | Koh | 6' 1" | 205 lbs. | -- | 4 | 1 | 0 | |||
| Shingo | Kohara | 5' 6" | 135 lbs. | -- | 1 | 0 | 0 | |||
| Brad | Kohler | 5' 9" | 220 lbs. | -- | Orthodox | 12 | 15 | 0 | ||
| Charlie | Kohler | 5' 9" | 155 lbs. | -- | Orthodox | 8 | 4 | 1 | ||
| Tsuyoshi | Kohsaka | TK | 5' 11" | 225 lbs. | -- | Orthodox | 27 | 19 | 2 | |
| Kaloyan | Kolev | 6' 2" | 205 lbs. | 73.0" | Orthodox | 10 | 1 | 0 | ||
| John | Kolosci | 5' 11" | 185 lbs. | -- | Orthodox | 15 | 9 | 0 |