What happened: Mautz joins the club from Triple-A Memphis. Ferguson enters the designated-for-assignment process.
Why it matters: The transaction gives the pitching staff a new left-handed option. Ferguson loses his place on the 40-man roster while his status is resolved.
By the numbers: St. Louis is 68-68 with a minus-10 run differential.
What to watch: Mautz's initial role and Ferguson's next destination are the points to watch.