CoCo Vandeweghe's coach Pat Cash shared a funny video on social media - showing just how much work tennis coaches have to do.
In the clip, Cash laughs that he and his colleagues are using towels to dry off a puddle-laden court - while his player and her practice partner Svetlana Kuznetsova talk on the sidelines.
As the Australian shows the state of play on the court, he takes a sneaky shot of the players deep in discussion, and chuckles: "The players are doing just nothing, chatting, while us coaches are with our towels, mopping up. Thanks, girls!"
The 25-year-old American has been working with Cash since the start of June, and reached the quarterfinals of Wimbledon with his guidance.