These passwords are to skip matches and/or to activate beast mode. Enter them when the game asks you for a password (case sensitive, no spaces).
The list is complete up to Ch 7 (including the matches for the upcoming update on Feb 1).
Beast-mode: unleashthekraken
Emerson challenge match
Won: beginnersluck
Lost: goodgame
Max challenge match
Won: 666
Lost: maxedout
Doubles match with Tobin as partner
Won: ayeayecapt
Lost: naycapt
Jacks challenge match
Won: iamno4
Lost: sackedbyjacks
Doubles match with Rayyan as partner
Won: goodpartner
Lost: dobetter
Doubles match against ESU
Won: firstwin
Lost: firstloss
Singles match against ESU
Won: empirescrumble
Lost: empireprevails
Challenge match
Won: secondtimelucky
Lost: secondtimeunlucky
Ruiz and Gonzalez match: ruizrizz
Quarter final Sam match
Won: someonehastowin
Lost: someonehastolose
Spoiler for upcoming update
Semi final match
Won: finalbossawaits
Lost: socloseyetsofar