| Name | Steam ID | Records | WRs |
|---|---|---|---|
| oovin | 76561198438574121 | 1 | 0 |
| [OO]YaboiDucki | 76561198195976589 | 2 | 0 |
| Oozey | 76561198121260492 | 724 | 1 |
| OpasnyBiceps | 76561198219126921 | 2 | 0 |
| OPE | 76561197996727011 | 1 | 0 |
| Opeezy | 76561198069508802 | 17 | 0 |
| OpenRift | 76561198123587870 | 1 | 0 |
| open wide and take ur medicine | 76561198856660725 | 2 | 0 |
| Operator | 76561197976105898 | 22 | 0 |
| oper_ru | 76561198135653580 | 5 | 0 |
| op|evilhf | 76561198037188949 | 1 | 0 |
| opexob10 | 76561198093998970 | 1 | 0 |
| opezdol | 76561198397361206 | 2 | 0 |
| opFez | 76561198090166251 | 1 | 0 |
| OP!Grels | 76561197970773675 | 2 | 0 |
| opierdol mi Cobble | 76561198044126433 | 1 | 0 |
| oplexz | 76561198122261704 | 1 | 0 |
| opmAU | 76561198336093185 | 5 | 0 |
| OPM Saitama | 76561198136297350 | 1 | 0 |
| Opp3k | 76561198257674543 | 2 | 0 |
| Oppai Sensei | 76561198116759626 | 2 | 0 |
| OppoiJaegr | 76561198182572531 | 8 | 0 |
| opp ƪµɱµkἀηᶑα | 76561198212355911 | 1 | 0 |
| OPRAH | 76561198216472764 | 2 | 0 |
| opt1cx | 76561198070081273 | 3 | 0 |
| oPti | 76561197989065442 | 4 | 0 |
| Opticalx | 76561199227344506 | 28 | 0 |
| Optigrill | 76561198051844735 | 4 | 0 |
| Optixx | 76561197984554346 | 1 | 0 |
| optkz | 76561197985276193 | 3 | 0 |
| Optrix | 76561198147972397 | 1 | 0 |
| Optиmиsт | 76561198387544892 | 19 | 0 |
| oQn | 76561198051734742 | 12 | 0 |
| o.Qv | 76561197967621265 | 3 | 0 |
| or2xb | 76561198037546906 | 7 | 0 |
| Oraltrolly | 76561198910602197 | 2 | 0 |
| Orange | 76561198138860062 | 1 | 0 |
| Orange | 76561198033387804 | 405 | 0 |
| OrangeCupcake | 76561197993022392 | 2 | 0 |
| Orange Julius | 76561197961892331 | 1 | 0 |
| orangepylon | 76561197998831768 | 1 | 0 |
| Oranger | 76561197983857550 | 1 | 0 |
| orangutan | 76561198097419969 | 1 | 0 |
| Orb | 76561198081924604 | 19 | 0 |
| Orbb | 76561197994217062 | 1 | 0 |
| Orbb | 76561198124792107 | 1 | 0 |
| ♛ Orb In Space ♛ | 76561197976413454 | 1 | 0 |
| OrbitalBoomStick | 76561198159571154 | 3 | 0 |
| OrbitaLᵂᴬᴿᴾ | 76561198009631429 | 3 | 0 |
| orca | 76561198195866023 | 97 | 1 |