A week after announcing she was 20 weeks pregnant with her first child, the mommy-to-be has clutched WTA's no. 1 ranking. My Dearest Baby, You gave me the strength I didn't know I had. You taught me the true meaning of serenity and peace. I can't wait to meet you. I

can't wait for you to join the players box next year. But most importantly, I am so happy to share being number one in the world with you.... once again today. On @alexisohanian bday. from the world's oldest number one to the world's youngest number one. -Your Mommy Congratulations!