A-Rod has left the building. Alex Rodriguez stormed out of his own grievance hearing Wednesday after arbitrator Fredric Horowitz ruled that baseball commissioner Bud Selig did not have to testify before the embattled slugger's attorneys. Rodriguez slammed his hand on a table at Major League Baseball's Manhattan office and cursed at baseball COO Rob Manfred, according to a source with knowledge of the proceedings. Horowitz was in the midst of the 12th day of hearings Wednesday on the grievance filed by the players' association to overturn the 211-game suspension given to the New York Yankees third baseman by MLB last summer for alleged violations of the sport's drug agreement and labor contract. "This is ridiculous," Rodriguez is said to have shouted after Horowitz issued his ruling shortly before noon at MLB's offices on Park Ave. Rodriguez then pointed his finger at Manfred, who directed baseball's investigation into the Biogenesis clinic suspected of being a source of supply of illegal PEDs to ballplayers, and said "You know you're full of s---!" After walking out of the hearing, Rodriguez issued a statement through his spokesman. "I am disgusted with this abusive process, designed to ensure that the player fails," Rodriguez's statement said. "I have sat through 10 days of testimony by felons and liars, sitting quietly through every minute, trying to respect the league and the process. This morning, after Bud Selig refused to come in and testify about his rationale for the unprecedented and totally baseless punishment he hit me with, the arbitrator selected by MLB and the Players Association refused to order Selig to come in and face me. "The absurdity and injustice just became too much. I walked out and will not participate any further in this farce."