This week in tweeting, Andrea Petkovic makes a play for the title of Twitter Q&A Queen, Novak Djokovic fields a proposal of sorts from Fabio Fognini, and Sabine Lisicki hangs out with 83-year-old Willie Mays and a 50-and-fit Barry Bonds. Plus, Serena Williams shouts out "bestie" Caroline Wozniacki's cross-sport aspiration. It's all here:
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