Nick Kyrgios packs on the PDA with girlfriend Costeen Hatzi as she cheers him on at Wimbledon

Nick Kyrgios’ new girlfriend Costeen Hatzi has been described as a key member of his team as their whirlwind romance heats up. 

And on Friday, Costeen, 21, was seen right by her man’s side at Wimbledon in the UK. 

Tennis bad boy Nick, 27, packed on the PDA with Costeen ahead of a practice session, holding her hand and kissing her as they walked around the courts.

Costeen, who is a university graduate, looked casual and chic in a pair of beige trousers which she teamed with a black T-shirt. 

Nick wore a pair of baggy purple basketball shorts and a black T-shirt and white cap.

The smitten tennis star kissed Costeen’s hand as they walked around and couldn’t keep his eyes off her as he trained for the event.  

Costeen, who is a university graduate, looked casual and chic in a pair of beige trousers which she teamed with a black T-shirt

The smitten tennis star kissed Costeen’s hand as they walked around and couldn’t keep his eyes off her as he trained for the event

On Monday, Nick kicked off his Wimbledon campaign with a typically colourful press conference in which he called five-set doubles ‘the stupidest thing ever’ and said he could make top-10 players ‘look ordinary’.

He was talking to the media at the All England Club ahead of his opening-round match against Paul Jubb on Tuesday.

As usual, he was brutally honest, especially when it came to playing doubles at the world’s most famous tournament.

On Monday, Nick kicked off his Wimbledon campaign with a typically colourful press conference in which he called five-set doubles ‘the stupidest thing ever’ and said he could make top-10 players ‘look ordinary’

‘To be honest, I’m not really looking forward to playing best-of-five sets doubles,’ Nick said at the media conference.

‘I think it’s the stupidest thing ever, to be brutally honest … no-one wants to play best-of-five sets doubles, no-one wants to watch best-of-five sets doubles.’

Nick is set to reunite with good friend Thanasi Kokkinakis to play doubles at Wimbledon to go along with the usual singles draw. 

Back in April meanwhile, Nick sparked engagement rumours when he posted a photo on Instagram of his girlfriend wearing a ring on her wedding finger. However, Nick’s manager denied the pair were engaged

The pair wowed the crowd with some dazzling play when winning the doubles title at the Australian Open in January, where doubles games are only best-of-three. 

Back in April meanwhile, Nick sparked engagement rumours when he posted a photo on Instagram of his girlfriend wearing a ring on her wedding finger.

However, Nick’s manager denied the pair were engaged.

The athlete went Instagram official with Costeen in December following his split from longtime girlfriend Chiara Passari.

Costeen watched all of Nick’s games during the Australian Open at Melbourne Park in January, and has been described as a key member of his team.

The athlete went Instagram official with Costeen in December following his split from longtime girlfriend Chiara Passari