Marcus Smart may start first preseason game for Boston Celtics

It sounds like Marcus Smart has impressed the coaching staff enough to be the day one starter.  He just has to be healthy enough to take advantage.

Marcus Smart could start preseason opener if healthy: A list of Boston Celtics injury updates | masslive.com

The Boston Celtics rookie will miss Sunday’s practice with a strained groin, but could still start Monday night against Philadelphia at the TD Garden. Head coach Brad Stevens called Smart "between questionable and probable, however you want to say it." "I’ll either start Marcus, if he’s available, or I’ll start Evan there," Stevens said. "And Phil (Pressey) will be the backup."

I think you've got your depth chart (for now) right there.  While Rondo is out, Smart is the starter, with Evan Turner backing him up and Phil Pressey getting time as well.