One issue was resolved by late afternoon: Baltimore's game against the New York Yankees was postponed until a date to be determined.
The status of Machado's knee, however, remained a mystery. The third baseman was initially diagnosed with a sprained knee after an awkward swing forced him to the ground in the batter's box.
Machado received an MRI later than expected Tuesday. Manager Buck Showalter was optimistic about the expected result.
He said, "Until everybody weighs in I feel more positive than negative, especially after talking to Manny."
Machado isn't Baltimore's only injured infielder. Shortstop J.J. Hardy has a sprained left thumb.