Riske and Stephen are expected to get hitched on July 20 going by their social media posts.
In her first-ever Grand Slam quarters, Riske gave Serena, who is now in the final and will take on Simona Halep on Saturday, the sternest of tests before going down fighting 4-6, 6-4, 3-6.
Serena was broken five times in a match which ebbed and flowed innumerable times.
Riske, 29, signed off from the tournament on a high, having already defeated three seeded players, including world number one Australian Ashleigh Barty.
Now it's time for Riske, who hails from Pittsburgh in the US, to focus on her wedding date with Stephen whose surname rings a bell as his father Anand Amritraj and uncle Vijay Amritraj who both enjoyed long standing careers in tennis. Stephen's paternal cousin Prakash Amritraj has represented India in the Davis Cup.
Stephen also played the game at the Duke University and had a short pro career in tennis before moving on to the business side of the sport to be the Chief Tennis Officer at Universal Tennis Rating.
Riske reached the third round of the Australian Open in 2014 and 2017, and the fourth round of the US Open in 2013 which marked her rise.
The Wimbledon performances this year will now see her leapfrog quite a bit from her current world ranking of 55.
Riske could even find herself seeded at the US Open after her superb string of four successive three-set triumphs which came to an end with the loss to Serena.
( With inputs from IANS )