The defending champion will play his first match of the tournament tomorrow.

champion 来自拉丁语 campio（战士、斗士），指在竞赛或比赛中获胜的人或团队。在体育赛事中特指"冠军"。 defending champion 指"卫冕冠军"，即上一届比赛的冠军正在为保持冠军头衔而战。