Alex Gordon, the club's regular leadoff hitter last season, has hit second recently. He's batting just .177 with two homers.
That has left Yost to rotate second baseman Yuniesky Betancourt, outfielder Jason Bourgeois and infielder Chris Getz at the leadoff spot based on matchups.
Getz, hitting .296, batted first on Monday and Tuesday. Betancourt, batting .324 with a .375 on-base percentage, hit leadoff for the first time in his career on Saturday.
"Both fit the bill because they're both swinging the bat well and they're both table-setter guys," Yost said. "Yuni isn't striking out; he's putting the ball in play. Getz has been doing a good job offensively, too."
Yost said Gordon's struggles have created the revolving door in the leadoff spot.
"We don't really have a prototypical No. 1-type hitter," Yost said, "so we've just been trying some different options to try to get some offense on the board."