opponent, adversary
"Él es fuerte y no tiene un adversario igual con el que puede luchar."
He is strong and has no equal opponent he can fight.
— La leyenda de Baahubali: el inicio (2015)
Él sorprendió a su adversario.
He surprised his opponent.
Él es un adversario formidable.
He is a formidable adversary.
Él será nuestro adversario, definitivamente.
He will definitely be our adversary.
— Toni Erdmann (2016)
He matado a muchos intentando encontrar un adversario digno.
I have killed many while trying to find a worthy adversary.
— Kung fu (2004)