What happened: The Cincinnati Reds sent infielder Ke'Bryan Hayes on a Major League rehab assignment to High-A Dayton. Hayes joined the Dragons to log game reps as he works toward a return to the big-league roster.

Why it matters: A rehab assignment is the final on-field step before activation, so Hayes' clock has effectively started toward rejoining Cincinnati's infield. Getting his bat and glove back would firm up a Reds lineup that sits at 40-46 and has scuffled through its last five games.

What to watch: Watch Hayes' at-bats and innings in the field at Dayton for signs the Reds are ready to activate him. His readiness will dictate whether Cincinnati makes a corresponding roster move in the coming days.