高芙轻松战胜格拉切娃，开启美网卫冕之旅

美网卫冕冠军高芙在首轮比赛中轻松战胜瓦尔瓦拉·格拉切娃，她将今年的美网视为“胜利巡回”。

Original Title: Gauff starts US Open defence with routine win
Article Content:
Defending champion Coco Gauff says she is treating this year’s US Open as a “victory lap” after comfortably beating Varvara Gracheva in her opening match.

Original article: https://www.bbc.com/sport/tennis/articles/c3ej0zg9gxno