Pittsburgh Steelers running back Jerome Bettis won't play in Sunday's season opener against Tennessee because of the strained right calf that kept him out of the team's final preseason game. With Bettis and Duce Staley (knee surgery) hurting, coach Bill Cowher said No. 3 running back Willie Parker will make his first career start. Parker, a college backup at North Carolina, ran for 102 yards against Buffalo on Jan. 2 in his only extensive playing time as a rookie. Staley hasn't been ruled out -- he is listed as questionable -- but missed the entire preseason and has practiced only once with the team since training camp began.