The agent for Mariano Rivera said that the evaluation Monday of the 42-year-old Yankees injured knee did not go smoothly. "We ran into complications," agent Fernando Cuza told the New York Post. "I am referring to Dr. (Christopher) Ahmad and (Yankees GM) Brian Cashman for further information." Ahmad, of New York Presbyterian Hospital, is the Yankees' team physician. A high-ranking team official told Tuesday morning that he didn't believe the complications were serious, but he said the team was still gathering information.