Nick Kyrgios’ girlfriend Costeen Hatzi called ‘trainer’ on Wimbledon pass

As Nick Kyrgios continues to rile up his opponents and spectators at Wimbledon, it seems his girlfriend Costeen Hatzi is also getting in on the action.

The 21-year-old university graduate was pictured cheering on the World No. 40 from the stands on Monday as he scrapped his way into the  quarter-finals with a hard-fought win over rising American Brandon Nakashima.

While this was hardly unusual for Ms Hatzi, who has watched every one of Kyrgios’ games since the Australian Open, one detail in her courtside outfit caught the attention of eagle-eyed tennis fans.

A closer looked at the VIP pass around her neck revealed she wasn’t simply a plus-one for the polarising Australian, 27, but was in fact listed as a ‘player’s trainer’.

This detail will no doubt rankle Kyrgios’ many critics because Ms Hatzi, an aspiring influencer who is legally blind, is not a qualified trainer and has never played at a professional level.

Of course, while she is not a trainer in a traditional sense, there is no doubt Ms Hatzi is playing a crucial role in her boyfriend’s career at the moment.

Kyrgios himself has credited her with helping him stay focused on his game, calling her his ‘greatest blessing’, and insiders say she has been instrumental in turning his life around after a tumultuous few years.

The 21-year-old university graduate was pictured cheering on the World No. 40 from the stands on Monday as he scrapped his way into the Wimbledon quarter-finals

A closer looked at the VIP pass around her neck revealed she wasn’t simply a plus-one for the polarising Australian, 27, but was in fact listed as a ‘player’s trainer’

This detail will no doubt rankle Kyrgios’ many critics because Ms Hatzi, an aspiring influencer who is legally blind, is not a qualified trainer and has never played at a professional level. (Pictured on July 3)

Kyrgios, known to his supporters as a loveable rogue and to his detractors as an unprofessional brat, is being fuelled by his critics as he bids to achieve a best grand slam result at Wimbledon.

After the drama and recriminations of his clash with Stefanos Tsitsipas, the Australian’s fourth-round match against Brandon Nakashima on Centre Court on Monday afternoon was a much less tempestuous affair.

Kyrgios struggled with a shoulder problem but recovered from a set down and then clinched the decider against 20-year-old American Nakashima, winning 4-6 6-4 7-6 (2) 3-6 6-2 to set up a quarter-final with Chile’s Cristian Garin.

While she is not a trainer in a traditional sense, there is no doubt Ms Hatzi is playing a crucial role in her boyfriend’s career at the moment. (The couple are seen kissing courtside on July 3)

Kyrgios himself has credited her with helping him stay focused on his game, calling her his ‘greatest blessing’, and insiders say she has been instrumental in turning his life around after a tumultuous few years. (Kyrgios and Hatzi are seen in a recent Instagram post)

Kyrgios’ battle against Tsitsipas was undoubtedly the most talked-about match of the tournament so far, and he received plenty of criticism for his on-court behaviour.

‘Honestly, I don’t care,’ said Kyrgios. ‘I just smile. It’s so funny. I joke around with my team about it so much. It’s hilarious.

‘I almost just wake up and read things, and I just laugh. And I never forget things people say, whether it was three, four years ago, things that just stick with me.

‘I have a massive chip on my shoulder. I sit here now in the quarter-finals of Wimbledon again, and I just know there’s so many people that are so upset.’

After the drama and recriminations of his clash with Stefanos Tsitsipas, the Australian’s fourth-round match against Brandon Nakashima on Centre Court on Monday afternoon was a much less tempestuous affair. He overcame a shoulder problem to secure a victory

Fourth seed Tsitsipas had labelled Kyrgios a bully and said he had an ‘evil’ side as bad blood from their fiery clash on Saturday continued into the post-match news conferences.

Fellow Australian Pat Cash, Wimbledon champion in 1987, joined the chorus of disapproval after Kyrgios’ toxic third-round clash with the Greek – a match which showcased the good, the bad and the ugly of his personality.

‘He’s brought tennis to the lowest level I can see as far as gamesmanship, cheating, manipulation, abuse, aggressive behaviour to umpires, to linesmen,’ Cash said.

Fourth seed Tsitsipas (pictured) had labelled Kyrgios a bully and said he had an ‘evil’ side as bad blood from their fiery clash on Saturday continued into the post-match news conferences 

‘Something has got to be done about it. It’s just an absolute circus. ‘It’s gone to the absolute limit now.’

Kyrgios was fined $10,000 after his first-round match for spitting towards a fan, was warned for swearing on Saturday and then called for Tsitsipas to be defaulted after the Greek hit a ball close to a spectator’s head after losing the second set.

Both players received fines on Sunday.

Kyrgios, whose talent is undeniable, has a long rap sheet of brushes with authority, but judging by the buzz around Centre Court for his match against Nakashima on Monday, fans find the maverick Australian compelling viewing.

Kyrgios, whose talent is undeniable, has a long rap sheet of brushes with authority. (He is pictured throwing his racquet in disgust at the 2016 Australian Open in Melbourne)