| First | Last | Nickname | Ht. | Wt. | Reach | Stance | W | L | D | Belt |
|---|---|---|---|---|---|---|---|---|---|---|
| Rene | Kronvold | 5' 8" | 170 lbs. | -- | Orthodox | 5 | 1 | 0 | ||
| Kaynan | Kruschewsky | Bahia | 6' 0" | 155 lbs. | 73.0" | Orthodox | 15 | 3 | 0 | |
| Jorgen | Kruth | The Last Viking | 6' 2" | 205 lbs. | -- | 5 | 0 | 0 | ||
| Nikita | Krylov | The Miner | 6' 3" | 205 lbs. | 77.0" | Orthodox | 30 | 11 | 0 | |
| Mariusz | Ksiazkiewicz | The Iron Pol | 6' 3" | 185 lbs. | 75.0" | Southpaw | 8 | 1 | 0 | |
| Eliezer | Kubanza | 5' 9" | 170 lbs. | 74.0" | Orthodox | 7 | 1 | 0 | ||
| Junya | Kudo | -- | 135 lbs. | -- | Orthodox | 10 | 7 | 2 | ||
| John | Kuhner | -- | 170 lbs. | -- | 1 | 2 | 0 | |||
| Michael | Kuiper | 6' 0" | 185 lbs. | 73.0" | Orthodox | 15 | 5 | 0 | ||
| Anton | Kuivanen | 5' 8" | 155 lbs. | 72.0" | Orthodox | 24 | 10 | 0 | ||
| Maiju | Kujala | -- | 135 lbs. | -- | 6 | 3 | 0 | |||
| Sumit | Kumar | The Indian Kid | 5' 5" | 125 lbs. | 66.0" | Orthodox | 8 | 1 | 0 | |
| Aleksei | Kunchenko | 5' 8" | 170 lbs. | 70.0" | Orthodox | 20 | 2 | 0 | ||
| Rizvan | Kuniev | 6' 4" | 240 lbs. | 76.0" | Orthodox | 12 | 3 | 1 | ||
| Keigo | Kunihara | 6' 0" | 235 lbs. | -- | Orthodox | 3 | 2 | 0 | ||
| Kiichi | Kunimoto | Strasser | 5' 10" | 170 lbs. | 71.0" | Orthodox | 18 | 7 | 2 | |
| Jon | Kunneman | AK-47 | -- | 185 lbs. | -- | 10 | 0 | 0 | ||
| Leo | Kuntz | The Lion | 5' 10" | 155 lbs. | -- | Orthodox | 18 | 4 | 1 | |
| Korey | Kuppe | 6' 5" | 170 lbs. | 77.0" | Switch | 8 | 4 | 0 | ||
| Ramazan | Kuramagomedov | 6' 1" | 170 lbs. | 73.0" | Orthodox | 8 | 0 | 0 | ||
| Tsuyoshi | Kurihara | 5' 10" | 185 lbs. | -- | Orthodox | 10 | 8 | 2 | ||
| Eldari | Kurtanidze | 5' 6" | 235 lbs. | -- | Orthodox | 0 | 1 | 0 | ||
| Kyle | Kurtz | -- | 170 lbs. | -- | 7 | 5 | 0 | |||
| Guram | Kutateladze | Georgian Viking | 5' 11" | 155 lbs. | 72.0" | Orthodox | 13 | 5 | 0 |