Racing PositionsBesiktas sign Adriano from Barcelona8YESPN staffBarca's Adriano probed for alleged tax fraud9YAssociated PressAdriano back in Barcelona contention9YESPN staffAdriano decides to prolong Barca contract9YAdriano would bet Messi plays against Real9YESPN staffAdriano considering Barcelona exit - agent10YPA SportBarca's Adriano heart problem detected10Y