Steffi Graf and Andre Agassi have confirmed they are expecting a baby.
The baby, the first for both, is due in mid-December.
Agassi and Graf, who have been living in Agassi's Las Vegas home, recently bought a $23m home in the San Francisco Bay area.
"This is a very exciting time for us," Agassi said in a statement.
"We are so happy to have been blessed with this gift."
"I do not know what their plans are for marriage," said Todd Wilson, spokesman for Agassi Enterprises.
Agassi was previously married to actress Brooke Shields. After they married in April 1997, Agassi's ranking tumbled to No 141.
They divorced two years later, and when he began dating Graf in 1999 in Paris, he began a career comeback by winning the French Open. He's currently the third-ranked men's player in the world.
Graf retired after the 1999 Wimbledon tournament.