PHOENIX The Milwaukee Brewers found out Zack Greinke maymiss opening day because of rib injury and later got into abench-clearing skirmish Tuesday with the Dodgers during a 7-1 loss to LosAngeles. Greinke is likely to begin the season on the disabled list afterbreaking a right rib while playing pickup basketball in theoffseason. The 2009 AL Cy Young winner is expected to be out two tofour weeks.