Here are the top 100 players ranked by kills per root game.

KPRG Player
13.05 o mikros
11.16 michele
10.72 Rafkrik
9.93 vecker
8.92 Dude111
8.78 Rastaa Man :)
8.74 pipacs
8.57 Anitram
8.33 kdiceplaya!
8.20 stakaboo
8.14 arkenkor
8.14 Im Defeated
8.09 spanky6
7.75 longhair
7.73 Beach_Bum_13
7.60 Oliversdad
7.59 PauloZo
7.54 integral
7.49 Brennwert
7.45 Scrappa
7.22 El Destructor
7.18 voxall
7.16 Shevar
7.15 KingRussy
6.90 sexybabe
6.78 antiochus_megas
6.67 potato27
6.55 Kurwa_pendecho
6.52 MWixxx
6.45 hcdug
6.43 nW0
6.38 champion22
6.25 DutchBastard
6.18 TASOS1
6.00 rocka09
5.85 Honyo
5.85 lastmurti
5.70 Smoke Two Joints
5.69 panzer
5.67 Gauntlet15
5.67 22 april
5.64 masticore
5.62 Whitehawk
5.62 THRILLHO
5.40 spman
5.38 ALexei3
5.29 prymus
5.29 Calavera
5.27 alex_sfb
5.26 markobg
5.23 Spliffn
5.14 Lalita Lani
5.07 nothin
4.98 piers plowman
4.98 Created
4.98 EddyB
4.96 captainLAGER
4.94 burcin
4.87 unlucky4bunny
4.85 Fatman_x
4.85 maccba
4.82 Tagur2
4.81 MaxWanted
4.77 Carmocha
4.76 habit1
4.67 Rebel9
4.66 Jack Barrows
4.63 dasfury
4.55 bivo
4.47 greeen
4.46 VagPounder69
4.45 BenJa LeZana
4.40 Schwabba_is_back
4.31 LemonSong
4.21 vino_en_carton
4.18 Caephus
4.02 scotlandpower
3.72 Boromakot
3.71 Gurgi
3.69 donik
3.67 andrea92
3.65 ninGATO
3.52 Exa
3.51 Gnací
3.50 john_egg
3.35 Loobee
3.32 Josey Wales
3.02 geor2205
2.85 negramarta
2.72 apignarb
2.62 king-ara
2.11 Arnas Bro
2.03 Ldice
2.00 Soromon
1.92 Beer Me!
1.79 jurgen
1.46 Thibz
1.33 kamyuen
0.58 spman2
0.30 franklyghost