During the final match, her opponent suffered a cramp and had to stop.

opponent 是名词，由前缀 op-（表示"反对、对抗"）和词根 -pon-（表示"放置"）加上后缀 -ent（表示"人"）组成，字面意思是"站在对立面的人"，即"对手、竞争者"。