Anna Kournikova's mother could face up to 15 years in prison if she is convicted of child neglect after her five-year-old son jumped from a second-floor window while at home alone.
Neighbours found little Allan Kournikova screaming in pain and bleeding on the pavement outside his luxury home in Palm Beach, Florida.
His mother, Alla, had left the house to run errands and locked him in.
Neglect: Anna Kournikova, right, and her mother Alla, left, smile at her little brother, Allan, in Miami in this 2007 file photo. Alla has now been charged with neglect after Allan, now five, jumped from a second-storey window
Accused: former tennis beauty Anna Kournikova's mother Alla has been charged with child neglect
The blond-haired, blue-eyed boy was recovering after treatment in hospital today.
Under Florida law, if neglect results in an injury to a child, the charge can be elevated to a second degree felony.
Elisa Kramer, a spokeswoman for Florida's Department of Children and Families, said officers interviewed family members at the hospital and determined there was no need to take Allan into their care.
'Our primary focus is always making sure the child is safe,' she said.
'In this case there were other family members willing and capable of taking care of the five-year-old boy.'
But she added: 'Our investigation is not closed.'
Allan is the half-brother of tennis star Anna, 28, who lives 50 miles away in Miami.
'He's just a normal kid who loves to run around. He can't sit still for a minute,' the Moscow-born player said in an interview with the Palm Beach Daily News published just a day before the incident.
Mrs Kournikova, 46, who has never publicly revealed the identity of her young son's father, told police she had gone out to the bank and post office but left Allan on his own at home watching television because he did not want to go with her.
She left him a telephone and locked the front door with a dead-bolt to stop him wandering out.
'Kournikova knowingly left her five-year-old son in her residence unsupervised for in excess of 50 minutes,' said Detective Keith Medeiros in a police report.
'The boy jumped off a second storey roof that was approximately 15 feet high and landed in a white stone yard between two air conditioning units. The child stated he hung by his hands before letting go.'
Allan landed painfully on a patch of stones with no shoes or socks, then headed for the swimming pool to soothe his injured feet. A neighbour later found him wandering outside in the street and called police.
Officers found a ladder and broke into the house through the second-floor playroom, where Allan told them he had jumped from.
Tennis glamour girl: Anna Kournikova described her half-brother as 'a normal kid who can't sit still for a minute'
'They were unable to exit the residence as all the doors were locked with a key-type deadbolt lock. All the windows were painted shut or shuttered,' said Detective Medeiros.
Police left a message on Mrs Kournikova's mobile voicemail and met her when she returned home.
'She stated that the child was awake and sitting on the couch watching television at the time she left the residence and that he did not want to go with her to run errands.
'She advised she dead-bolted the residence and left him with a phone,' the police report revealed.
It goes on: 'Kournikova failed to provide the necessary supervision to maintain the child's physical well-being...the child had bruising about his feet and lower back as a result of the fall from the second floor. Kournikova is the child's mother and primary caregiver.'
Motherly love: Alla Kournikova seen with her daughter when she was a ten-year-old tennis prodigy training at an academy in Florida
The report adds: 'Based on the above stated facts, there is probable cause to charge Alla Vladimirovna Kournikova with one count of child neglect, a third degree felony.'
She was released from the Palm Beach County Jail after posting a $3,000 bail.
In the Palm Beach Daily News interview, Anna Kournikova - who has the same mother as Allan but a different father - described her little brother as a promising sportsman despite his tender age and pint-sized physique.
He takes lessons in riding, golf and tennis, speaks fluent Spanish and Russian, and is a fan of Scooby-Doo, McDonald's and pizza.
'He's just having fun right now,' Anna said. 'I've always been an advocate of kids being active and not sitting in front of a computer all day.
'My mom has done a great job because he's so polite. He says please and thank you.'
Anna's mother also told the newspaper for the same article that Allan goes to primary school for three hours a day, 'and then we ask: "What are we going to do today?" I want him to stay busy.
'I want him to be occupied...Some kids don't want to do what we do with lessons but he does. He's a cool guy with a lot of energy.
The Kournikovas moved to Florida from their native Moscow when Anna was 10 after she gained a place at the Nick Bolletieri academy.
Once a semi-finalist at Wimbledon, she was better known for her glamorous image than for success on the court, although she reached No.8 in the singles rankings and won two grand slam doubles tournaments.
She is now retired from tennis with a back injury.
