Opponent
Rival
Contestant
Adversary
He is a shrewd and sometimes ruthless adversary.
They were adversaries in the tennis match.
I tried to comfort him after he was defeated by his opponent.
His forceful arguments reduced his opponents to silence.
His opponent did not stand a chance.
He jeered at a defeated opponent.
He is slashing wildly at his opponent with a sword.
Never underestimate your opponent.
The strongest opponent
Competitor
You are not qualified to be my opponent.
