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| May 31 | ||
|---|---|---|
  Mindfreak   Trident Esports in the ACL Brisbane 2015. | ||
 F/A |  Astra Infinite  GW Ventus in the EGE South Africa 2015. | |
 VanQuish Gaming  Suda in the ETG 10. | ||
 OpTic Gaming  FaZe Clan in the MLG GameBattles 5000 Series 2015-05-31. | ||
| May 30 | ||
 wG | Colgate, Jake, Maple, and Zer0 join. | |
 vQ | Nverted joins as temporary substitute for ETG 10. FEARS leaves. | |
 Elevate  Prophecy in the UMG Gaming 2000 Series 2015-05-30. | ||
 MAGI | JHustleR leaves. | |
| May 29 | ||
| Capture the Flag will be removed from competitive rules before MLG Pro League 2015 Season 3 Relegation. | ||
 EPSI | Joee, MarkyB, Rated, and Reedy join. | |
 Purist Gaming Peanut butter in the MLG GameBattles Amateur 1K Series 2015-05-29. | ||
| May 28 | ||
 Ex.Y | Team signs roster of  EcHo Gaming. Bance, Desire, Nathan, and Vortex join. | |
 EcHo | Roster is acquired by  Exertus eSports.Youth. Bance, Desire, Nathan, and Vortex leave. | |
 LIQ | Duke, Kolgaa, and Pibo join. | |
 IGI | Harley joins. KraQz leaves. | |
 dT.P | Baker, Dimi, Fox, and Stringo join. | |
 dT.B | Assault, FEARS, Jump, and Swarley join. | |
 dT | Baker, Dimi, Fox, and Stringo leave. | |
 Mutiny Gaming  VexX Gaming in the MLG Pro League 2015 Season 3 Relegation Qualifier. | ||
 Dream Team Purple,  Geared 4 Gaming, Mutiny Gaming, and VexX Gaming qualify for MLG Pro League 2015 Season 3 Relegation. | ||
| May 27 | ||
 3sUP,  Dream Team,  Epsilon Esports,  iSolation eSports,  Strictly Business,  Orbit eSport,  vVv Gaming, and  Enigma6 Group (from  Team JusTus) receive invitations to MLG Pro League 2015 Season 3 Relegation. | ||
 BRG | LXT, RusH, SunnyB, and Urban leave. | |
 VexX | Aries and Vicious join. | |
| May 26 | ||
 xL | Carbines joins. JME leaves. | |
 SYN | Miyagi and Pacman join. FEARS and KozMo leave. | |
 sB | Anticity, StuDyy, and TcM join. Spacely rejoins. | |
 vVv | KiLLa joins. SinfuL leaves. | |
 aR | Lawless and MerK join. Blfire and FeLonY rejoin. | |
 DNL | FeLonY leaves. | |
| May 26 (approx.) | ||
 Bz | Assault, GodLike, REPPIN, and Swarley leave. | |
| May 25 | ||
| EPSI | Nagafen, Remy, Royalty, and Swanny join. | |
 DOG$ | Scarz joins. Lipe leaves. | |
 ORB | Burns joins. Lawless leaves. | |
 ON | Mochila joins. KiLLa leaves. | |
| EPSI | MadCat and Swanny leave. | |
 UX | Bullet, Cosmo, and Sylar join. DaMagic, FreddyK, and Theros leave. | |
 proph | Apathy, AquA, and Octane rejoin. | |
| May 25 (approx.) | ||
 StDx | ILLSkilL, Myth, Royalty, and Stevey leave. | |
 XPRES | Buka, Lucky, Oney, and Sukry leave. | |
| May 24 | ||
 fabE | POW3R joins. | |
| DOG$ | Crawly joins. Yago leaves. | |
 Barrage eSports SWE Team Orbit in the DreamHack Swedish Championship. | ||
| Enigma6 Group Goon Squad in the MES Detroit 20K. | ||
Elevate  Denial Esports in the MLG GameBattles 5000 Series 2015-05-24. | ||
 HyperGames Team  Supremacy in the SFCO AW 3. | ||
 XPRESIV'E Club  Gamers2 in the WhatYouPlay Season Cup. | ||
| May 23 | ||
 FaZe | LlamaGod leaves as substitute at end of MLG Pro League 2015 Season 2 Regular Season. | |
 ENVY | Lawless and Methodz leave as substitutes at end of MLG Pro League 2015 Season 2 Regular Season. | |
| aR | PRPLXD leaves as substitute at end of MLG Pro League 2015 Season 2 Regular Season. | |
| ENVY | MerK returns from loan to Team JusTus. | |
| ON | Huhdle leaves as substitute at end of MLG Pro League 2015 Season 2 Regular Season. | |
| proph | Octane leaves. | |
| proph | Happy leaves as substitute at end of MLG Pro League 2015 Season 2 Regular Season. | |
| proph | Octane joins. Apathy, AquA, and Nagafen leave. | |
 Jus | Octane, StuDyy, and TcM leave. MerK's loan from Team Envy ends. | |
| Orbit + NV FaZe Clan in the UMG Gaming 2000 Series 2015-05-23. | ||
| May 22 | ||
 AwG | Joee and Rated leave. | |
| Dead End Hashtag AW in the MLG GameBattles Amateur 1K Series 2015-05-22. | ||
OpTic Gaming  FaZe Red in the MLG Pro League 2015 Season 2 Regular Season. | ||
| May 21 | ||
 TRDT | Beastn, Chilean, Damage, and Fate join. | |
 iN | Beastn, Chilean, Damage, and Fate leave. | |
 SSOF | RicK joins. | |
| aR | Anticity, Burns, Mochila, and Spacely leave. | |
 Sy | Team acquires roster of  FaZe France. Malls, Vortex, Zeroo, and ZylewR join. | |
 FZ.FR | Malls, Vortex, Zeroo, and ZylewR leave. | |
 CALL | Doty joins. Fortu leaves. | |
 VrT | Horid and Vixen join. Doty and Goldz leave. | |
| May 20 (approx.) | ||
 Rx | Priestahh joins. | |
 ROY | Priestahh leaves. | |
 MTNY | Lacefield and Nelson join. Lyric and Quality leave. | |
| May 20 | ||
| SSOF | Ninnja leaves. | |
| May 19 | ||
| BRG | SunnyB joins. | |
| May 18 (approx.) | ||
| VexX | Jsano and RecK leave. | |
 Ignite | Aries, Dimi, Miyagi, and Saint leave. | |
| dT | Dimi and Fox join. GodRx and Vicious leave. | |
| May 18 | ||
 V.St | Peatie and Watson join. MarkyB and Reedy leave. | |
| AwG | Peatie and Watson leave. | |
| May 17 | ||
 Rift | Dqvee, HaLLy, Hawqeh, and Lewiss join. Cosmic, Insight, Jake, and Tazz leave. | |
| OpTic Gaming FaZe Clan in the UMG California 2015. | ||
| May 16 | ||
| BARR | Burnsy, Cappeh, and Solid join. | |
| May 15 (approx.) | ||
| XPRES | Buka, Lucky, Oney, and Sukry join. | |
| May 15 | ||
 G2 | TojoR leaves. | |
 SKF | Bundo joins. Vilesyder leaves. | |
| May 14 | ||
| EcHo | Team signs roster of  Team Sereni7y. Bance, Desire, Nathan, and Vortex join. | |
 Se7 | Roster is signed by EcHo Gaming. Bance, Desire, Nathan, and Vortex leave. | |
| May 13 | ||
| vVv | Team acquires roster of Strictly Business. John, PHiZZURP, SinfuL, and TwiZz join. | |
| sB | Roster is signed by vVv Gaming. John, PHiZZURP, SinfuL, and TwiZz leave. | |
| May 12 (approx.) | ||
| Se7 | Bance and Vortex join. | |
| May 12 | ||
| vQ | FEARS, Pemby, ProFeeZy, and Silpy join. | |
 TCM | MadCat rejoins. | |
| IGI | Agon, aMaZe, Chain, and KraQz join. | |
| May 11 | ||
| G2 | peLukaa (temporary substitute) leaves. | |
| BRG | Bance leaves. | |
 OG | Enable (temporary substitute) leaves. | |
| EPSI | Faccento and Remy (temporary substitutes) leave. | |
| May 11 (approx.) | ||
| dT | GodRx joins. Fearsome leaves. | |
| May 10 (approx.) | ||
 G4G | Cells, Envoy, Pickles, and Simple join. | |
| May 10 | ||
| DOG$ | Lipe joins. | |
| OpTic Gaming Prophecy in the Gfinity Spring Masters 2015. | ||
| iSolation eSports Elevate in the MLG GameBattles 5000 Series 2015-05-10. | ||
| May 9 | ||
 Automatic Reload Elevate in the UMG Gaming 2000 Series 2015-05-09. | ||
| May 8 | ||
| TCM | GunShy retires. | |
 UPR.iG | Excite, Guydra, Killerpie, and Skrzm join. | |
 Royalty Esports SFM 1K Champs in the MLG GameBattles Amateur 1K Series 2015-05-08. | ||
| May 7 | ||
| Ignite | Aries, Dimi, Miyagi, and Saint join. | |
| EPSI | Faccento and Remy join as temporary substitutes for Gfinity Spring Masters 2015. | |
 tR | Faccento and Remy leave. | |
| May 6 | ||
| G2 | peLukaa joins as temporary substitute for Gfinity Spring Masters 2015, replacing TojoR because of academic commitments. | |
| May 5 | ||
| LIQ | Donny joins. | |
 NK | Caio, Martino, RecKz, and Stalizy join. | |
| CALL | Caio leaves. | |
| EPSI | Tommey (temporary substitute) leaves. | |
| May 5 (approx.) | ||
 NxG | Donny, Duke, Kolgaa, and Pibo leave. | |
| May 4 | ||
| SYN | KozMo joins. Jump leaves. | |
| V.St | Joshh joins. | |
| EPSI | Joshh leaves. | |
| tR | AquA and Nagafen leave. | |
| May 3 | ||
| OpTic Gaming Denial Esports in the ESWC 2015. | ||
 Team Envy FaZe Clan in the MLG GameBattles 5000 Series 2015-05-03. | ||
| May 2 | ||
 Rise Nation FaZe Clan in the UMG Gaming 5000 Series 2015-05-02. | ||
| May 1 (approx.) | ||
 aM | Carry and Wanted leave. | |
 bS | Atura, GLogics, Mayhem, and Simple leave. | |
| dT | Baker, Fearsome, Stringo, and Vicious join. | |
| MTNY | Lyric, Nuglect, Quality, and Riviction join. | |
| SKF | Azzi, Dean, Quinz, and Vilesyder join. | |
 INC | Astrz, Bacabec, Invincible, and Lakie join. | |
 VFL | Donny, Frido, RapteeuR, and Simo leave. | |
| ORB | BeanBag, Detain, MOUVAA, and Zer0 leave. | |
 MEN | Meemis joins. beakd leaves. | |
 I4L | Telo, WizR, Zayrox, and ZeeK leave. | |
| May 1 | ||
| Royalty Esports 1k thing yeah in the MLG GameBattles Amateur 1K Series 2015-05-01. | ||