Well Roger is the pirate king, not the 1v1 champion. Those are two different things
I knew it would be too much for you to understand the correlation — how do you think rewards and careers are built and given to characters if they don't need to defeat anyone to prove their strength, etc.?
Let me show you:
Now you need a list to prove something the world of One Piece itself already acknowledges?
Kaidou was introduced with the line: 'If it's one-on-one, always bet on Kaidou.' That’s not said for nothing. It’s a reputation built over decades, recognized by marines, pirates, and even the narrator.
This story isn’t an RPG stat sheet that only becomes true when it’s shown and drawn.
Roger, the Pirate King himself, doesn’t have a single on-screen 1v1 win against anyone truly strong — and yet his legacy and position are unquestionable. He’s even used as a benchmark in many cases, often preceded by the phrase 'even Roger...'
So stop being dense.