Zack Greinke pitched with a case of the flu on Monday, Fox Sports' Ken Rosenthal reports.

Greinke pitched with a case of the flu on Monday, Fox Sports' Ken Rosenthal reports.

Analysis:

Greinke was uncharacteristically shaky in his Diamondbacks debut Monday, allowing seven runs over just four innings of work. Rosenthal's report sheds some light on why Greinke did not look like himself on the mound against the Rockies. According to Rosenthal, Greinke was adamant about not missing his start despite being sick. Look for Greinke to bounce back in his next scheduled appearance Saturday.