Serena Williams is famous for her dominance on the tennis court, winning 39 Grand Slam titles, four Olympic gold medals and the most women's singles matches in Grand Slam history. Personally, she has kept a relatively low profile, letting her play do the talking. That changed in 2017 when Williams announced she and then-fiance Alexis Ohanian were expecting their first child, confirming that she was eight weeks pregnant when she won her 23rd Grand Slam singles title. The impending birth also set the stage for "Being Serena," a five-part documentary that provides unprecedented access to Williams during her pregnancy, new motherhood and marriage. The behind-the-scenes, first-person portrait delves into her landmark career, family life and her impact as a businesswoman and investor.