| Name | Steam ID | Records | WRs |
|---|---|---|---|
| Undead | 76561198127183665 | 1 | 0 |
| UndeadAgr | 76561198065844301 | 4 | 0 |
| uN*DeaD|eXten | 76561198113076079 | 2 | 0 |
| Undecide | 76561198091100883 | 5 | 0 |
| undefined.OwL | 76561198129981779 | 1 | 0 |
| Under | 76561198328502655 | 1 | 0 |
| underdog | 76561198043880899 | 1 | 0 |
| Underdog | 76561198153445374 | 4 | 0 |
| Under_Dog | 76561198254883338 | 1 | 0 |
| Underestimated Power | 76561198262742446 | 72 | 0 |
| underscore | 76561198043727436 | 1 | 0 |
| Understandable | 76561198150982440 | 6 | 0 |
| UNDERTAKER | 76561198257412363 | 506 | 0 |
| undichter | 76561197990279762 | 1 | 0 |
| Undied | 76561198220685539 | 4 | 0 |
| undroptik | 76561197993065441 | 1 | 0 |
| unforeseen consequences | 76561198117538023 | 16 | 0 |
| Unfulfilled dreams | 76561198139366279 | 12 | 0 |
| unga bunga | 76561198392854777 | 1 | 0 |
| Ungerleider | 76561198012770138 | 1 | 0 |
| Unh0ly | 76561198272396961 | 1 | 0 |
| UnholyBliss | 76561197978111465 | 4 | 0 |
| uni | 76561198138735839 | 1 | 0 |
| uni | 76561198170374761 | 6 | 0 |
| uniCojo🦄 | 76561198250562298 | 42 | 0 |
| unicolored | 76561197965927760 | 2 | 0 |
| UNiCORN | 76561197994076182 | 2 | 0 |
| Uniest | 76561198091737225 | 1 | 0 |
| UnImpre | 76561198079166427 | 1 | 0 |
| UniqueWolfz | 76561198415970429 | 3 | 0 |
| Unit-00 | 76561198024367936 | 1 | 0 |
| Unit64 | 76561197997828717 | 2 | 0 |
| Unit - Booby | 76561198034366300 | 7 | 0 |
| United States, Position 5 | 76561198260009421 | 510 | 0 |
| Unity | 76561198019913557 | 1 | 0 |
| UNITY | 76561199157147443 | 1 | 0 |
| [â–˛] UNIVAK | 76561198257134039 | 1 | 0 |
| Universal | 76561198039885709 | 25 | 0 |
| Universium | 76561199153390032 | 13 | 0 |
| Un_jay | 76561198387112853 | 1 | 0 |
| unk_ | 76561198196210593 | 4 | 0 |
| unk1nd123 | 76561198073956939 | 1 | 0 |
| Unkind Name | 76561198367268415 | 1 | 0 |
| unkn0wn | 76561198376608433 | 1 | 0 |
| _Unknown | 76561198271364405 | 1 | 0 |
| UNknown | 76561198376517575 | 1 | 0 |
| UnknownCat | 76561198013813537 | 1 | 0 |
| unknownplayer | 76561198295884981 | 1 | 0 |
| Unknwn | 76561197960405159 | 1 | 0 |
| unL.mojo | 76561197990569984 | 1 | 0 |