It took four innings for Yankee catcher Russell Martin to pick up on it, he said. Then, it was so obvious he kicked himself for missing it.

Martin alleges that the Toronto Blue Jays were stealing his signs Thursday during their 16-7 drubbing of the Yankees. He said he began to believe this when he noticed that Toronto runners at second base would turn their heads one way, toward the shortstop, when a fastball was coming and the other way, toward the second baseman, for an offspeed pitch.

Martin...