Tennis: Steffi Graf and Andre Agassi ' to marry in September'

Steffi Graf and Andre Agassi are reported to be planning a private wedding next month in Las Vegas.

The German magazine Gala says they have begun preparations for a ceremony on September 8.

It says they will wed at Agassi's home in a private service.

Only a handful of close friends and relatives are said to have been invited.

Steffi's father Peter has reportedly not had an invitation. He split from her mother Heidi several years ago and the estranged couple have not met since.

The couple are expecting a baby boy this December.