Besides Thanos and Darkseid, off the top of your head, who can knock Superman out?

[ALMIGHTY GOD]

grand opening grand closing. The gap between them is larger if its an older shazam too. He's weak against magic and Shazam's powers are all magic based so he'd get beaten, but an older shazam with more combat experience? he'd wash superman easily.

do you read comics? CANON comics? not happening. matter of fact he already lost in the new 52

 

[Breh the HitMang]

anyone with magic

 

[Professor Emeritus]

Squirrel Girl goes without saying

 

[twan83]

anyone with magic

He have him under his control and can put kryptonite on his sword if he wants K.O

he a walking troll

 

[parallax]

Knock out?
Matello
Captain marvel
Wonder woman
Dr fate

Carol got knocked into space by the hulk, shes not fukking with supes. Genis on the other hand

 

[Norrin Radd]

 

[-DMP-]

 

[Devilinurear]

Carol got knocked into space by the hulk, shes not fukking with supes. Genis on the other hand

I mean billy baston captain marvel.

 

[MJ Truth]

Give you know who some prep time...

 

[Dirty Mcdrawz]

Martian Manhunter is just as strong as Supes and has telepathy and heat vision.

 

[humminbird]

Martian manhunter
Edit someone beat me to it
Supergirl

 

[richaveli83]

Doomsday
Anyone with magical powers
Mongol

 

[darealvelle]

anybody with magic

 

[R=G]

No one said Silver Surfer...interesting...he can knock Superman out, repower him, and knock his ass out again.

 

[Wallychamp]