opponent

他在选举中面对一个政治对手。

He faced a political ___opponent in the election.

卡梅莉塔是她在排球决赛中的对手。

Carmelita was her ___opponent in the volleyball final.

她的对手脚踝受伤，不得不退出比赛。

Her ___opponent injured her ankle and had to withdraw from the match.