What happened: The Braves selected left-hander Ray Kerr to the major league roster Sunday and designated left-hander Danny Young for assignment. Young's DFA follows a stint on a rehab assignment with the FCL Braves earlier this summer.

Why it matters: The swap gives Atlanta a fresh left-handed arm for its bullpen mix as the club works through a active series against Arizona. Young now enters the seven-day DFA window, during which he can be traded, claimed on waivers, or outrighted to the minors if he clears.

What to watch: Watch whether another club claims Young off waivers or he clears to Triple-A, and how Atlanta deploys Kerr out of the bullpen in the coming days.