The connecting record
shownOne Punch Man · ch. 27
Deep Sea King beat Mumen Rider in One Punch Man.
Knocked unconscious; Saitama catches him as he falls.
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 · Mumen Rider · rank 14
Satoru
Has held the top of C-class for more than half a year without taking the promotion he is eligible for, and said mid-fight that he is too weak to be a B-class hero, which is the register being told the truth by somebody inside it and left holding a number that fits. Why he never moved up is not something the story says. Rode at the Deep Sea King after it had gone through everyone in front of him, and got back up twice.
statedOne Punch Man · ch. 27, p. 20
Says mid-fight that he is too weak to be a B-class hero, and does not back down.
statedOne Punch Man · ch. 23, p. 16
Has kept the top position in C-class for more than half a year.
statedOne Punch Man · ch. 27, pp. 22-25
Tells the Deep Sea King that whether or not he stands a chance is beside the point.
All 7 citations
shownOne Punch Man · ch. 27, pp. 13-21
Attacks the Deep Sea King alone after Genos has been beaten, and is thrown around and swatted away.
shownOne Punch Man · ch. 27, pp. 22-25
Gets back on his feet after being thrown aside and attacks again.
shownOne Punch Man · ch. 29, pp. 16-18
Buys Saitama a drink at an oden shop to mark Saitama's promotion to B-class.
shownOne Punch Man · ch. 70, pp. 43-44
Fights monsters invading the hospital while still injured from Garou.
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.