Both regions' Challenger Cup will be played in a double-elimination, best-of-three bracket, with the top two sides securing spots in their region's ECS Season 6 league. The North American Challenger Cup will kick off on Tuesday, September 25, and will run until October 2. In Europe, the tournament will run from Thursday, September 27 to Sunday, September 30. After transferring to another organization, MIBR will have to fight their way back into ECS in the upcoming Challenger Cup As one of the bottom two teams from the previous season, Gambit will face four qualified teams, LDLC, Epsilon, HAVU, and Space Soldiers, as well as three invited teams (as EnVyUs forfeited their slot): HellRaisers, North, and OpTic. In North America, Complexity will have to fight their way back into the league after placing last in the previous season, while OpTic's slot was given to an invited team as the lineup made a transfer to Europe. Gorilla Gang, Bravado, AZIO, and lmfao advanced to the NA Challenger Cup via open qualifiers, while FURIA, MIBR, and TeamOne received direct invites. The first-round matchups in each region are the following: North America (Tuesday, September 25)
Complexity vs. lmfao
FURIA vs. Bravado
TeamOne vs. Gorilla Gang
MIBR vs. AZIO
Europe (Thursday, September 27)
Gambit vs. HAVU
HellRaisers vs. LDLC
North vs. Epsilon
OpTic vs. Space Soldiers
 FURIA #77  Guilherme 'spacca' Spacca Andrei 'arT' Piovezan Yuri 'yuurih' Santos Vinicius 'VINI' Figueiredo Kaike 'KSCERATO' Cerato  Bravado #64  Dimitri 'Detrony' Hadjipaschali Ruan 'ELUSIVE' van Wyk Aran 'Sonic' Groesbeek Rhys 'Fadey' Armstrong Johnny 'JT' Theodosiou  HAVU #42  Jesse 'zehN' Linjala Eetu 'sAw' Saha Lasse 'ZOREE' Uronen Olli 'sLowi' Pitkänen Otto 'ottoNd' Sihvo  Gambit #20  Dauren 'AdreN' Kystaubayev Mihail 'Dosia' Stolyarov Rustem 'mou' Telepov Abay 'HObbit' Khassenov Nikolay 'mir' Bityukov   North #6   Mathias 'MSL' Lauridsen Philip 'aizy' Aistrup Markus 'Kjaerbye' Kjærbye Valdemar 'valde' Bjørn Vangså Nikolaj 'niko' Kristensen   LDLC #37   Antoine 'to1nou' Pirard Alex 'ALEX' McMeekin François 'amanek' Delaunay David 'devoduvek' Dobrosavljevic Logan 'LOGAN' Corti  AZIO #66  Trevor 'FrostayK' Bandle Logan 'Voltage' Long Ryan 'Snakes' Amann Michael 'Grim' Wince Gage 'Infinite' Green  Space Soldiers #39  Engin 'MAJ3R' Küpeli Ismailcan 'XANTARES' Dörtkardeş Buğra 'Calyx' Arkın Ahmet 'paz' Karahoca Engin 'ngiN' Kor  TeamOne #50  Bruno 'BIT' Fukuda Lima Pedro 'Maluk3' Campos Nicolas 'NikoM' Miozzi Victor 'iDk' Torraca Alencar 'trk' Rossato  MIBR #4  Gabriel 'FalleN' Toledo Tarik 'tarik' Celik Fernando 'fer' Alvarenga Jake 'Stewie2K' Yip Marcelo 'coldzera' David  Gorilla Gang #57  Victor 'food' Wong Ryan 'ryann' Welsh Anthony 'vanity' Malaspina Cameron 'cam' Kern Josh 'oSee' Ohm   Complexity #11   Shahzeb 'ShahZaM' Khan Rory 'dephh' Jackson Peter 'stanislaw' Jarguz Jaccob 'yay' Whiteaker Bradley 'ANDROID' Fodor  Epsilon #56  Joey 'CRUC1AL' Steusel Kia 'Surreal' Man Aaron 'frei' Frei Daniel 'djL' Narancic Benjamin 'blameF' Bremer  OpTic #24  Marco 'Snappi' Pfeiffer René 'cajunb' Borg Jakob 'JUGi' Hansen Nicklas 'gade' Gade Kristian 'k0nfig' Wienecke  lmfao  Ian 'motm' Hardy Austin 'RenZ' Dickman Anthony 'Nervous' Boring Kevin '4pack' Przypasniak Marcos 'tacitus' Castilho  HellRaisers #10  Kirill 'ANGE1' Karasiow Vladyslav 'bondik' Nechyporchuk Özgür 'woxic' Eker Bence 'DeadFox' Böröcz Issa 'ISSAA' Murad |