WATCH: Novak Djokovic 'knocked out' by a ball boy in ping pong battle

WATCH: Highlights from Novak Djokovic's second-round victory over Maxime Cressy in Paris

Novak Djokovic kicked off his Rolex Paris Masters campaign with a bang, quickly getting back to his winning ways to claim a spot in the round of 16 on Tuesday.

Even amid practice, press and, of course, the actual tennis, the world No. 7 still found time to hang out with the local ball boys—and get himself locked into a table tennis battle in the process.

In a clip posted to social media, Djokovic is shown steadily losing ground in a game of mini ping pong as a small crowd gathers to watch. With his back (literally) against the wall, the 35-year-old was finally nailed in the arm by the ball boy’s winning shot—and his reaction was both hilarious and Oscar-worthy.

Check out the video here, and don’t miss the end to see the “knockout” blow.

As always, Djokovic was a good sport as he hammed it up for the kids. But on the tennis court, the former world No. 1 showed no mercy in his 7-6 (1), 6-4 victory over serve-and-volleyer Maxime Cressy on Tuesday. It also marked his 10th consecutive match win, after winning back-to-back titles in Tel Aviv and Astana.

"It was very intense, just a lot of pressure," Djokovic said after the match. "When you play someone that serves this well—first and second serve—you don't have much room to relax and maybe play kind of a softer few games. You just have to be on your toes all the time.

"I was very pleased with the way I held my serve, didn't face a break point."

Djokovic, the defending champion in Paris, is going for his seventh title at the indoor hard-court event and will be seeking last-minute tuneups ahead of his return to the Nitto ATP Finals later this month.

Seeded No. 1, he will next face Karen Khachanov on Thursday for a place in the quarterfinals.