- 6 Kenneth
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- 3 Kenneth "Sage" Culbertson
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- 2 Kenni
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- 4 Keukeu51
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- 5 Kevin Letz
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- 2 Kewpie []
- 2 Khali-Shi
- 3 KhanArtist
- 4 Kick!
- 2 kid_fierce
- 2 Kidbull
- 2 Kieran -(((GONTERF)))- Bacon
- 8 Kijiro
- 5 KiLLaH!
- 2 KillBait!
- 2 KillBait! (UT2K3) Alan Willard (UT)
- 3 KillBait! (UT2K4) Alan Willard (UT)
- 2 KilleFrag
- 3 Killer ('em all)
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- 7 Killy_McGee
- 3 Killy_McGee.:{DEA}:.
- 2 Kim "Grim" Ericsson
- 3 Kimmo
- 26 Kimmo "Cardiologist" Kontto
- 4 KING B
- 18 King Henri
- 14 KingJosh
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- 10 KingRichet
- 4 KINGshinobi
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- 20 Klasnic
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- 2 Klayman136
- 9 kLeptO*
- 8 KnighT
- 6 KnT^ aka KnighT