After arbitrator Fredric Horowitz ruled that commissioner Bud Selig did not have to testify before his attorneys, Alex Rodriguez stormed out of his own grievance hearing Wednesday.

According to a source, Rodriguez slammed his hand on a table at Major League Baseball's Manhattan Park Avenue offices and cursed at MLB chief operating officer Rob Manfred.

"This is ridiculous!" Rodriguez is said to have shouted after Horowitz issued his ruling shortly before noon.

Rodriguez then pointed a finger at Manfred, who directed MLB's investigation into the since-shuttered Biogenesis clinic suspected of being a source of illegal performance-enhancing drugs for ballplayers, and said "This is f---ing bulls---!"