Martin says Diaz wouldn't allow him to throw new baseballs back to his pitchers after fouls during New York's 6-5 win over the Los Angeles Angels on Wednesday night.
Martin and Diaz got into it early in the game, and Martin says Diaz "was punishing me" by making all of the throws himself. Martin prefers to make the throws to keep his arm loose for base-stealers.
Martin, who hails from Chelsea, Que., says Diaz told him that throwing the balls was "a privilege I had to earn."
Martin was mystified by Diaz's treatment. He is a three-time All-Star selection and a Gold Glove winner with the Los Angeles Dodgers in 2007.
Diaz was unavailable for comment because Martin spoke nearly an hour after the game.