The brother of tennis legend Steffi Graf is seemingly living in the secret tunnels under Las Vegas while a warrant is out for his arrest in Nevada. 

Graf, now 57 and a 22-time Grand Slam winner, built a new life in Las Vegas decades ago with her husband, Andre Agassi. They were followed by her younger brother Michael and his four children. 

But disturbing new details of his life have emerged, with the 55-year-old sharing a string of rambling videos on his Facebook page seemingly in the tunnels under the city.

Steffi, meanwhile, appears to be living the picture-perfect life in Las Vegas, with Agassi posting a video on social media of the pair playing tennis together in the sunshine, captioned: ‘How lovely to dream while you’re awake.’ 

In various posts from Michael on his Facebook page, he is sat in front of a wall of graffiti and visibly dejected with disheveled hair, rambling into the camera in many videos incoherent due to audio issues.

But in some of his rambling videos, he takes aim at his brother-in-law Agassi, recounting an alleged physical altercation between the pair. There is no evidence to support his claims the alleged incident took place. The Daily Mail has contacted Agassi’s representatives for comment. 

Michael Graf posted a string of rambling videos seemingly in the tunnels beneath Las Vegas

Michael’s sister, Steffi, is married to fellow tennis legend Andre Agassi and also lives in Vegas

Michael Graf, pictured after being booked for DUI in February, has a warrant out for his arrest

‘I truly believe that Andre enjoyed hitting me as hard as he could. I truly believe he liked it,’ he says. 

‘I mean, that’s understandable. I just kept pushing all sorts of buttons. I just thought to myself: What the hell, another idiot? I don’t mean to say that her partners are idiots, but I just thought… no, no, no!

‘I mean, I really gave him a good whack. It was like… a real pirate move.’

He then offered more bizarre details on the alleged encounter, adding: ‘And the only reason I pinched his nipples is because he wasn’t wearing his pirate earrings anymore. Otherwise, I would have dragged him behind me by his earrings, 100 percent.’

The tunnels beneath Las Vegas originally developed as a flood protection and drainage network have since become a dangerous habitat for homeless people beneath the casinos and hotels, with estimates of over 1,000 living in the vast 480km system. 

It is currently unclear how long Graf has been in the underworld, where his belongings appear to be in a shopping cart, after he was previously said to be living in a tent at Lake Mead near Las Vegas.

But court documents seen by the Daily Mail show he was issued with a bench warrant in Nevada for violating court conditions over a criminal misdemeanor charge of trespass, not amounting to burglary.

Graf was given a no-contact order and ordered to stay out of trouble before the case was closed, but a check on his requirements in March showed he was arrested by Boulder City Police for DUI in violation of the order.

Boulder City Police Department told the Daily Mail he was arrested on February 12, 2026 after an open alcoholic container was found in his vehicle.  

After he failed to appear for a status check on his stay out of trouble violation on March 26, a bench warrant was issued for his arrest and remains active. 

It is the latest spate of legal troubles after he was arrested for violent outbursts in Las Vegas in 2020.

At that time, sister Steffi supported him, buying him a house and reportedly financing his lawyers as well as seeking legal guardianship, according to Blick.

Graf and Agassi have built their life together in Las Vegas, the city where Agassi grew up

The two tennis legends were joined in Las Vegas by her brother, Michael, and his four kids

Michael Graf (front left) with Steffi (right) and parents Heidi and Peter in an old family photo

He reportedly moved out of his house after his second failed marriage earlier this year, starting a nomadic lifestyle in the desert and occasionally living out of his Tesla.

But it is claimed his camp burned down due to a fire in August, then he crashed his Tesla in September.

Back in 2014, Steffi Graf told Hello! about how her family settled in Las Vegas due to the strong family connection with Agassi ‘born and raised’ there.

She added: ‘And then very shortly after my mum moved to Las Vegas, and then my brother and his four kids, so we have all the family there. All the cousins are together and growing up together – it’s pretty neat.’

She told Tennis Magazine in 2008 that she never envisioned living in Las Vegas when her playing career ended.  

‘I literally had no idea where I was going to live,’ she said. ‘I just felt that I’ve been able to see so much of the world that I wanted to explore that more. 

‘Now living with two kids, and another great thing is my mom lives here, and so does my brother with his four kids. Andre, you know, [was] born and raised here, so we have such a tight-knit family and friend circuit. I feel very blessed.’

Just last month, Agassi gave Hello! an insight into his marriage to Graf and their private life together in Las Vegas as he prepared to take part in the Laver Cup.  

‘She likes seeing me happy, just like I like seeing her happy,’ he said. ‘She knows this is a week in Laver Cup that I value, that I bond with, that I connect to. It’s a lot of work, but she’s never been scared of me in work [mode]. 

‘I always promised her I wouldn’t be too busy or too bored – because I’m kind of dangerous in both! She appreciates my connection to it, so she’ll smile for a week.’