FILE - In this Jan. 28, 2017, file photo, Alexis Ohanian, fiance of Serena Williams, watches Williams play her sister, Venus, in the women's singles final at the Australian Open tennis championships in Melbourne, Australia. A spokeswoman for Serena Williams says the tennis star is pregnant. Earlier in the day, Williams posted a photo of herself on the social media site Snapchat with the caption "20 weeks." Williams announced in late December that she was engaged to Reddit co-founder Ohanian. (AP Photo/Aaron Favila, File)