"Lleyton and Bec met five years ago at a Starlight Foundation charity tennis day and rekindled their relationship late last year," the statement said.
"The couple were instantly committed to each other and their close connection has been well documented in the media through their public acknowledgement and mutual support.
"Bec proudly revealed the ring presented to her by Lleyton earlier this evening to overjoyed family and friends at the post-tennis final celebrations."