Tennis star Serena Williams returned to the No 1 spot in the WTA ranking charts on Monday without having played a single tournament since her Australian Open win in January. Serena shared her happiness with a message on Instagram for her unborn child. Serene’s Instagram post reads, "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".