"arguing" is opposite to "arguing against"

Hopefully this is due to misconmunification.I believe my english is correct; but if it is wrong, sorry.

Let me say in another way to avoid any potential confusion: I agree that Polger is better than current Yifan. But, still, I am not convinced that Polger见一个灭一个 in woman tournament.Yifan may have less than 10% of chance, but miracle happens in any sports.