Sir Aldingar (Child 59) has the villainous knight confronted by a champion much smaller than himself. Initially contemptuous, Aldingar gets his come-uppance:

'He stroke the first stroke att Aldingar,
He stroke away his leggs by his knee;
        . . . . . .
        . . . . .
Sayes, Stand vp, stand vp, thou false traitor,
And fight vpon thy feete;
For and thou thriue as thou begins,
Of a height wee shalbe meete.'

which I edited down to:

'He struck first at Aldingar, took his legs off at the knee,
"Stand up stand up, you false traitor, now you’re a match for me"'

Sir Aldingar