Cavaliers and Celtics prepare to renew rivalry (AP)

Shaquille O'Neal spent his final day of free time where any super hero would hang out. He went to Disney World. Now Superman is preparing for his Cleveland Cavaliers debut against the Boston Celtics on Tuesday night in one of the league's most heated rivalries. The two teams that open the season in the East could also be the final two teams remaining in the conference finals -- though...