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SAN DIEGO – The father of retired tennis pro Mark Philippoussis was arrested for allegedly molesting two minors who took lessons from him, authorities announced Tuesday.

Nikolaos Philippoussis, 68, was arrested at his home in Mira Mesa, San Diego County Sheriff’s Lt. Greg Rylaarsdam said. No other details were provided about their investigation.

“We’ve developed probable cause to believe that this did in fact occur,”  Rylaarsdam told FOX 5.

Philippoussis is the father of retired Australian professional tennis player Mark Philippoussis, who has participated in a couple San Diego Aviators competitions this season. Mark is a former Davis Cup champion and one-time Wimbledon finalist.

Philippoussis was booked on suspicion of committing lewd and faces several charges including lewd and lascivious acts on a person under age 14 and having sex with a child age 10 or younger. He was being held on $2.5 million bail pending arraignment, scheduled for Wednesday.

Anyone with information about the investigation should call sheriff’s child abuse unit at 858-974-2310. Tipsters may remain anonymous by calling 888-580-8477 and may be eligible for up to $1000 reward.

Sheriff Bill Gore posted a tweet about the investigation:

“Detectives from SDSheriff Child Abuse Unit looking for more victims in a molestation case in the North County. Call 858-974-2310.”

[UPDATE: July 26, 2017]

Philippoussis’ arraignment set for Wednesday was postponed, although he remains in jail, according to jail records.