From iGaming Business As part of his sponsorship deal with PokerStars, 2008 Olympic gold medallist and eleven-time Grand Slam tennis champion Rafael Nadal challenged 100 fans to a game of mobile online poker over the weekend. The Majorca-born tennis star will celebrate his 27th birthday on Monday and took part in the special PokerStars-sponsored competition during a break from his preparations to defend his French Open men’s singles title. “It’s no secret that I love the competition and that’s what I like about the game of poker,” said Nadal, who has won the world-famous Roland Garros tournament in each of…