The pair are expecting their first child together, which Novak announced in April 2014 on Twitter, writing: "Jelena is pregnant!!!We will be parents soon! #blessed"
Novak also shared his news on his Facebook fan page.
"My dear friends
," he wrote. "You've been with me through many tough and good times in my career.
"I've been blessed to travel the world, play the most beautiful sport that brings me a lot of excitement and joy; I am happy, loved and healthy. Jelena and I are truly blessed to soon become parents
! My love is pregnant!"