“@serenawilliams: You are the greatest of all time, not just in sport--I’m talking about as a mother and as a wife. I am so excited to write so many more chapters of our fairy tale together,” he wrote.
Williams and Ohanian were engaged in December. Williams gave birth to a girl named Alexis Olympia Ohanian Jr. on Sept. 1.
Williams has won 23 Grand Slam singles titles, a record for the professional era. She hasn't competed since winning the Australian Open last January — while pregnant. She has said she intends to return to the tennis tour for that same event next January.