Mills elected to lead off with Bourgeois and have Bourn hit immediately behind him Monday against the Rangers. It's the third time this season Bourgeois and Bourn have hit in that order and the ninth time Bourgeois has started a game as the leadoff hitter this year.
Mills said Bourgeois' .455 on-base percentage against left-handed pitchers made his choice easier with Derek Holland on the mound.
"I think if he's on, that's going to open up some holes for Bourn a little bit," Mills said. "[Bourn] can utilize his game a little bit, whether it's going to be bunting or hitting the ball through those holes."
Bourn said he doesn't mind where he's slotted in the lineup and doesn't want to change his mentality in the two-hole, but he will be more mindful of Bourgeois' speed if he gets on base.
"I won't swing early if they're going to let him run," Bourn said.
Mills said sometimes rotating players to a new spot in the lineup can create issues.
"But not with these two guys," he said. "There's one right-handed, one left-handed [batter]. They complement each other so well."