overmatch

Short definition from Wiktionary

Verb

1. 1
   To match more than intended.
2. 2
   To be more than equal to or a match for, to surpass; hence, to conquer, vanquish.
3. 3
   To marry (someone) to a superior.

Noun

1. 1
   A match in which one opponent is greatly superior to the other.
2. 2
   An opponent who is more than a match for another; one who cannot be defeated.