son adversaire

his/her opponent

→ son
phrase Rare #37,740
his/her opponent Son can refer to a male or female possessor; the context determines whether it means “his” or “her.”
FR: Elle a félicité son adversaire après le match.
EN: She congratulated her opponent after the match.

Mickey Conners ne fit qu'une bouchée de son adversaire sur le ring.

Mickey Conners made short work of his opponent in the ring.

Son adversaire du jour vient de Tianjin.

Today's opponent is from Tianjin.

— Le Maître d'armes (2006)

Le joueur d'échecs a mis son adversaire en échec.

The chess player put their opponent in check.

Elle a sous-estimé son adversaire.

She underestimated her opponent.

Il a battu son adversaire électoral.

He beat his electoral opponent.

Il a facilement écrasé son adversaire.

He easily crushed his opponent.

Il n'a aucune chance contre son adversaire.

He doesn’t stand a chance against his opponent.

Elle ne laisse aucune chance à son adversaire.

She leaves her opponent no chance.

— Dangal (2016)