Nikolaos Philippoussis, 68, will be formally charged at an arraignment scheduled for Wednesday afternoon in San Diego County Superior Court, said Lieutenant Greg Rylaarsdam of the San Diego County Sheriff's Department.
He was being held at San Diego Central jail in lieu of $2.5 million (1.92 million pounds) bond in the meantime.
Philippoussis was taken into custody at his home in the Mira Mar neighbourhood of San Diego after investigators established probable cause to support sexual allegations made against him, Rylaarsdam said.
Rylaarsdam said that the investigation was still "in the infancy". "We would love to talk to anybody who has information about this case, he said.
According to the San Diego County Sheriff's Department's inmate tracking website, Philippoussis had been booked on suspicion of sexual intercourse or sodomy with a child 10 years old or younger, lewd and lascivious acts on a child under 14 and oral copulation of a person under 18.
The arrest made headlines in San Diego, where Philippoussis gives personal tennis lessons, and in Australia where his celebrated for his successful pro tennis career.
Mark Philippoussis retired from professional tennis in 2015, having reached a top ranking of Number 8 in the world. In 2003 he played in the Wimbledon final, where he lost to Roger Federer.
Mark Philippoussis is not suspected of any wrongdoing in connection with the case against his father, Rylaarsdam said, adding: "There has been nothing in the investigation that would make us believe he has anything to do with this."
(Reporting by Dan Whitcomb; Editing by Michael Perry)
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