What happened: The journeyman catcher has emerged as a clubhouse leader through what he calls “delusional confidence.” Sullivan delivered his first career walk-off hit Wednesday, a two-run single with two outs in the 11th inning.

Why it matters: Colorado is trying to halt a run of three consecutive 100-loss seasons. Finishing below that mark would offer a modest sign of progress during another rebuilding year.

What to watch: Sullivan’s playing time and Colorado’s results through September will test whether his clubhouse influence translates into wins.