在体育比赛中，对手通常被称为"opponent"。这个词来源于拉丁文"opponere"，意思是"对抗"或"反对"。

例句：

My opponent in the tournament is a very skilled player. (我在比赛中的对手是一位非常有技巧的球员。)
The opponent's team scored a goal in the last minute of the game. (对手队在比赛的最后一分钟进了一个球。)
I'm feepng nervous about the upcoming match against my opponent. (我对即将到来的对手比赛感到紧张。)

在其他情况下，对手也可以被称为"adversary"，这个词来源于拉丁文"adversarius"，意思是"对立的"或"敌对的"。

例句：

My adversary in the debate made some very convincing arguments. (我在辩论中的对手提出了一些非常有说服力的论点。)
The company is facing strong competition from its main adversary in the market. (这家公司正在面临来自市场上主要对手的强大竞争。)