The couple's first child was born on Wednesday, but his name has not been made public yet.
Decker, 28, and Roddick, 33, who have been married since 2009, announced back in May that they were expecting. Throughout the summer, Decker shared pictures of her growing baby bump on social media.
Roddick retired from his career as a professional tennis player in 2012. Decker is currently starring on the Netflix comedy Grace and Frankie.