PARIS - MAY 24: Mark Philippoussis of Australia is watched by his farther Nick in his first round match against Luis Horna of Peru during Day One of the 2004 French Open Tennis Championship at Roland Garros on May 24, 2004 in Paris, France. (Photo by Clive Mason/Getty Images)

San Diego-based tennis coach and father of former Australian tennis champion, Mark Philippoussis, Nick Philippoussis, will face 14 counts of sex offence charges against minors under the age 10 years old.

Phillippoussis, who is an Australian national, was arrested at 9am local time on Wednesday morning in his San Diego home.

Mark was coached by his father throughout his professional career and has so far dodged all questions surrounding his fathers arrest.

Nick, 68, is expected to spend another night in jail and is currently being held on US $2.5 million (A$3.2 million) bail.

"He didn't know we were coming," Lieutenant Greg Rylaarsdam told Nine news.

"In this particular case we are in the infancy of the investigation.

"On a lots of cases we go all the way to the end and get all of our facts in order and all of the evidence lined up and then we go out and arrest somebody.

"But in a case like this where there is the potential of ongoing victimisation we developed probable cause and went out and arrested him when we had that.”

Mark is not under police investigation nor linked to his father's case in anyway.