Without doubt Matosevic is the best player in 2012. For the simple reason that he climbed the highest in the world rankings out of any player. From outside the top 200 to 49 is a climb of over 150 places. Much more impressive than Novak Djokovic who didn't even climb one place, while Roger Federer and Andy Murray moved up a single place.
So congratulations Marinko, the best player of 2012. Keep it up!