'F***ing p***y': Nick Kyrgios and brother mock Rafa Nadal in video

The feud between Nick Kyrgios and Rafael Nadal is unlikely to be resolved anytime soon, after Kyrgios’ brother Christos levelled a foul-mouthed insult at the Spanish superstar.

Nick Kyrgios broadcast a live video on Instagram from a pub after his four set loss to Nadal, in which Christos came on screen and called Nadal a “f***ing p***y”.

The firebrand Australian made some controversial comments of his own, repeatedly referring to Nadal as ‘Ralf’ and admitting to mocking the Spaniard throughout the match.

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"Bro every time he hit a good shot I turned to my box and was like 'yep, goodbye Ralf'," Kyrgios said.

It was a typically enigmatic moment from the controversial star, who appeared to be having much more fun before, during and after his three set loss alongside new mixed doubles partner Desirae Krawczyk.

Despite being spotted out late at the pub the day before his match with Nadal, Kyrgios’ performance in the heated grudge match was arguably one of his better displays.

While he was outpointed by Nadal on occasions, admitting as much after the game, Kyrgios put on the kind of show fans want to see from him more consistently.

Genie Bouchard spotted in Nick Kyrgios' box

Tennis fans are in a collective frenzy after Eugenie Bouchard sat in Nick Kyrgios’ players box at Wimbledon on Thursday.

There were hoards of keen observers for Kyrgios’ grudge match with Rafael Nadal on centre court at the All England Club.

And Bouchard was one of them.

Sitting right behind Kyrgios’ father and entourage was none other than the Canadian tennis star and her sister.

Fans were immediately intrigued about why she was there in Kyrgios’ corner, and even more so when she sent out a tweet of the Aussie serving with a number of love heart eyes emojis.

She even hit back at a number of fans who criticised Kyrgios for serving underarm.

Kyrgios and Bouchard have previously played mixed doubles together and seem to get along well off the court.

The pair practiced together in the lead-up to Wimbledon.

“He’s so chill, he’s very nice and was making the practice for me, which I appreciated,” Bouchard said.