Former NBA basketball players David Robinson, right, and Dikembe Mutumbo visit a street basketball tournament in Copenhagen, Thursday Oct. 1, 2009. Chicago is competing with Madrid, Rio de Janeiro and Tokyo for the right to host the 2016 Summer Olympic Games. The IOC will choose the winning city in a vote on Friday Oct. 2 in Copenhagen. AP Photo logo AP Photo 1 month ago

Former NBA basketball players David Robinson, right, and Dikembe Mutumbo visit a street basketball tournament in Copenhagen, Thursday Oct. 1, 2009. Chicago is competing with Madrid, Rio de Janeiro and Tokyo for the right to host the 2016 Summer Olympic Games. The IOC will choose the winning city in a vote on Friday Oct. 2 in Copenhagen.