Rafael Nadal took on the world today in a poker tournament hosted by Pokerstars on their Facebook app. Rafa played the low-stakes, play money NL zoom game against players while answering questions from a twitter #AskRafa session (talk about multitasking!). In the end, Rafa won the challenge 20-18. Pokerstars will make a donation to Care International based on Rafa’s winnings. Great job, Rafa!