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Mixed doubles anyone?

Roger Federer announced on Twitter that his wife Mirka delivered twin boys on Tuesday evening. Leo and Lenny join their four-year-old twin sisters Myla and Charlene, who were born in 2009.

The Federers hadn't revealed a due date, nor that Mirka was expecting another set of twins. But when Roger announced on Tuesday that he was withdrawing from this week's tournament in Madrid, the arrival seemed imminent.

We couldn't find the probability of having back-to-back twin deliveries (the numbers available on the Internet greatly vary), but it's safe to say the odds are extremely long, sort of like winning 17 Grand Slams.

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