What happened: The veteran left-hander has experienced a sharp statistical regression since changing clubs, a stark contrast to July when Robbie Ray extended a seven-outing run to 5-0. MLB Network analysis indicates his recent difficulties correlate with throwing to varying catchers.

Why it matters: Adjusting to a new backstop midseason can disrupt a pitcher's rhythm and game-planning. The drop in command and run prevention highlights the challenge of integrating a frontline starter into a pitching staff during a playoff push.

What to watch: Observers will monitor whether establishing a consistent catcher pairing can help him regain his pre-deadline form.