The tennis player, 34, showed off her toned arms and legs in a super sheer number that featured a voluminous train skirt and a sultry, lingerie-inspired bustier top.
Williams took to Instagram on December 14 to thank the sports mag for recognizing her accomplishments, sharing a picture of the sexy cover, in which she relaxes on a throne in a leg-baring leotard. "This year was spectacular for me," she wrote. "For @SportsIllustrated to recognize my hard work, my dedication, and my sheer determination gives me hope to continue on and do better. As I always say, it takes a village it's not just one person. This is not just an accomplishment for me, but for my whole team. I am beyond honored. I love you guys! 2016? #letsdoit."