O'Day made the announcement on his personal Twitter account. The 40-year-old righty hangs up his cleats after a 15-year career that included stints with the Angels, Mets, Rangers, Orioles, Braves and Yankees. He finishes with a stellar 2.59 ERA, 1.03 WHIP and 637/172 K/BB ratio across 609 innings (644 appearances) dating back to 2008. He made 28 relief appearances last season for Atlanta.

O'Day recently had to be pulled off a minor league rehab assignment after spraining his right big toe. He initially landed on the IL on July 12 due to a strained left calf. It's unclear if we'll see him again this year.

O'Day has been working his way back from a left calf strain, but now he'll need at least a few extra days to deal with this toe issue as well. The right-hander has been sidelined since July 12.

O'Day tossed a scoreless inning last Friday for Single-A Rome in his rehab assignment debut and will face some higher level minor league hitters before returning to the Braves' bullpen. The 39-year-old right-hander has been out since mid-July due to a left calf strain.