The connecting record
shownOne Punch Man · ch. 27
Deep Sea King beat Genos in One Punch Man.
Genos takes acid meant for a child, and is put through a wall with no means left to fight.
What each of them is ranked on
The winner · Deep Sea King · rank 11
One afternoon, and in no order the register would recognise: Stinger and Lightning Max out of A-class, then the S-class Puri-Puri Prisoner, then Sonic, who is on no register at all, then the four heroes at the shelter door, then Genos out of S-class again, and last of all the C-class Mumen Rider, beaten down twice and still the last man there to stand up. The story stops to draw every one of them losing. That sequence, rather than the single punch that ended it, is the clearest measure on this ladder of what the middle of the Association is actually worth.
shownOne Punch Man · ch. 23
Comes out of the sea and downs the hero Stinger with one punch.
shownOne Punch Man · ch. 24
Punches the A-class hero Lightning Max out of a building and into the street.
shownOne Punch Man · ch. 25
Beats the S-class hero Puri-Puri Prisoner with a combination ending in a kick that sends him through a building.
All 8 citations
shownOne Punch Man · ch. 25
Returns to full form in the rain and chases Sonic off the rooftops, leaving him only his clothes.
shownOne Punch Man · ch. 26
Puts down Jet Nice Guy, Bunbun Man, All Back-Man and Sneck at the evacuation shelter.
shownOne Punch Man · ch. 26-27
Tears Genos's arm off, spits acid at an evacuating child, and puts the cyborg through a wall.
shownOne Punch Man · ch. 27
Beats Mumen Rider down twice in front of the shelter and throws him into Saitama's arms.
statedOne Punch Man · ch. 28, p. 3
Calls himself the pinnacle of a pyramid containing every organism on Earth.
Beaten · Genos · rank 8
Demon Cyborg
Was admitted at the floor of S-class off a perfect hundred at the certification exam, and has been dismantled in itemised ways ever since: an arm off to the Deep Sea King, the left side of his face to Carnage Kabuto, an arm off to Garou — and, in a future Saitama then unwound, his core torn out by Garou as well. The damage log is the point — it is a running measurement of several other entries here. He also took a Dragon-level threat down alone.
statedOne Punch Man · ch. 16, pp. 14-16
Scores a hundred points at the certification exam and is designated S-class.
statedOne Punch Man · ch. 17
Reads the registry aloud and reports that he has been given the lowest position in S-class.
statedOne Punch Man · ch. 21, pp. 1-4
Tells Saitama he has not been moved off S-class rank 17, but is now sixth in popularity.
All 10 citations
statedOne-Punch Man Hero Encyclopedia · p. 37
Described as the first new S-class hero in two years.
shownOne Punch Man · ch. 26-27
The Deep Sea King rips his arm off, then puts him through a wall after he blocks acid aimed at a child.
shownOne Punch Man · ch. 10, p. 14
Carnage Kabuto breaks apart the left side of his face with one punch.
shownOne Punch Man · ch. 138, pp. 3-8
Neutralises one of the fusion's largest beams and melts the armour over his own core doing it.
shownOne Punch Man · ch. 83
Garou detaches his arm during their fight; the arm keeps working and slams Garou into a tree.
shownOne Punch Man · webcomic ch. 108, p. 7
Destroys the Forest King on his own, along with its army.
statedOne Punch Man · ch. 190
The manga sets the Forest King at Dragon level; the webcomic never assigns him a disaster level.
What this does not settle
One fight in one work. It is the only result the record gives between these two, and it is evidence about that meeting and nothing wider — not a general matchup, not a rematch, and not a ranking of its own.
The ladder above it is argued from everything either of them has been shown doing; this page is argued from one citation.
Where the two disagree, the disagreement is the point, and it stays visible rather than being resolved by whichever of them happens to be on this page.