Here are the 106 teams that will play in the upcoming ESL Challenger League Season 51 Cup 4 tournament.
99 teams (Europe - 48 teams, North America - 15 teams, South America - 14 teams, Asia - 14 teams, and Oceania - 8 teams) have been invited based on the Valve Regional Standings (VRS) invitation data as of April 6, 2026. The remaining 7 teams have been invited based on their finishing spots in ESEA League Season 56.
Teams will compete in a double-elimination brackets in their respective region, and the winner of each region will get invited to the ESL Challenger League Season 51 Regional Finals.

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

Europe
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

North America
VRS Invite

ESEA Advanced S56 NA

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

South America
VRS Invite

ESEA Open S56 SA

ESEA Open S56 SA

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

Asia
VRS Invite

ESEA Open S56 AS

ESEA Open S56 AS

Oceania
VRS Invite

Oceania
VRS Invite

Oceania
VRS Invite

Oceania
VRS Invite

Oceania
VRS Invite

Oceania
VRS Invite

Oceania
VRS Invite

Oceania
VRS Invite

ESAE Open S56 OCE

ESEA Open S56 OCE
Each team has received their invite based on their rosters stated in the VRS.
Note: the final roster submission deadline for all teams is April 15, 2026.
For a team to be eligible to accept their invitation they must retain a majority roster. In this case there are some notable points to consider when looking at the invited teams: