WALTHAM, Mass. -- There are only a handful of players remaining on the Boston Celtics' roster who played alongside Rajon Rondo and only one -- Avery Bradley -- who was there before the ACL tear that slowed Rondo after four consecutive All-Star appearances. And yet the legend of " National TV Rondo" has been passed on to a new generation of Celtics, including Isaiah Thomas, who emerged as the new face of the franchise in the aftermath of Rondo's being dealt to the Dallas Mavericks in December 2014. As the top-seeded Celtics prepare for their first-round matchup with the eighth-seeded Chicago Bulls, they are well aware of Rondo's propensity to elevate his play when the games matter most. "I'm a fan of the game. I know, whether he tries it or not, those big games he's always gonna be ready for them," Thomas said Friday after the Celtics went through their first workout of the postseason. The Celtics host the Bulls...