Here are your Wednesday morning PRO Rumor:

• Rob Biertempfel of the Pittsburgh Tribune-Review says the “Super 2″ rule that allows a certain percentage of players to become salary arbitration a year early may be discussed during the next collective bargaining agreement negotiations. The intent of the rule was to “avoid roster manipulations”, but that service required to qualify for a Super 2 is very predictable. Because of this, the Pirates will probably keep top prospect Pedro Alvarez in the Minors until late this summer to make sure he isn’t arbitration-eligible until 2014.
• Nick Piecoro of The Arizona Republic says the Diamondbacks are close to signing 17-year-old Dominican outfielder Wagner Mateo. The deal is believed to be worth $500,000.
• Joe Cowley of the Chicago Sun-Times says talks about A.J. Pierzynski’s future with the Chicago White Sox. Cowley mentions that Pierzynski is a free agent after this season, but he is a 10-and-5 players meaning that he can block any trade. The White Sox have incentive to trade him if they are not in contention, but it will require Pierzynski to sign off on any move.