The 40-year-old tennis hall of famed has been dating the 72-year-old Golisano since 2009.
Golisano announced the pending nuptials Thursday during an appearance at Bishop Kearney High School in Irondequoit, New York, The (Rochester) Democrat and Chronicle reported.
The two currently live in Florida and Golisano has recently expressed interest in purchasing the Buffalo Bills.
2014: NFL Cheerleaders [PHOTOS]
UPI horse racing weekend preview