The Princess of Wales, Kate Middleton, recently had the opportunity to challenge tennis champion Roger Federer on the court, and also got a behind-the-scenes look at what the ball boys and girls at Wimbledon do.

In a new video released by Wimbledon, Kate can be seen sporting a white tennis top, matching tennis skirt and high ponytail, greeting Federer on the court and chatting with him for a bit, before entering a doubles match.

“Shall we play some tennis?”

Federer asks her, to which she responds, “Yes, please.”

The pair then duke it out for a few sets, before getting to see the ball boys and girls do a ball change.

One ball girl named Molly even shows Kate how to stand on the sidelines of the court in position and throw back a tennis ball to a player with a straight arm.

Kate and Federer then speak with the ball boys and girls.

“When I’m watching the training, what should I be looking out for?”

Kate asks one ball boy named Alex, who responds, “Mainly the discipline and the neatness.”

Princess Kate and Federer then speak to the coaches and train with the teenagers at Wimbledon’s facility.

“When you look now on the outside courts, the most worn patch on the court is the position of the ball boys and the ball girls,” Wimbledon tournament director Jamie Baker tells Kate and Federer.

“To see the training and the dedication and the amount of time that is put into the training and making sure this goes well on the day for the champions who are playing at Wimbledon.

Yeah, it’s incredible to see it behind the scenes,” Kate says at the end of the video.

The ball boys and girls at Wimbledon are an important part of the tournament and there are approximately 250 teens in the programme, with the average age among them being 15, according to Wimbledon’s website.

They begin training in February at the Rains Park Community Sports Ground.