WATCH: Federer, Sock take over mixed doubles

It's pretty obvious that Roger Federer is enjoying himself at the Hopman Cup, with the latest example of that coming during mixed doubles against the U.S.

After Switzerland had already sealed the Saturday final spot with two singles wins, mixed doubles got a little loose. As Jack Sock served to Federer, Belinda Bencic decided to take a seat after the men hogged the court. CoCo Vandeweghe went a step further, heading over to the sidelines to watch the action. Bencic then sat in her chair and that’s when the guys started to pull out the tricks.

First came the tweeners in the rally, then a few behind-the-back shots. When they went between the legs once again, it looked like Federer was going to take the point with a short-angled shot. Sock, though, showed he had one more trick in store: a down-the-line tweener for a winner.

Federer collapsed as Sock exulted, but the Swiss team would have the last laugh as they completed a 3-0 sweep. In the final against what will most likely be a German team, Federer's fun ride is expected to continue.

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