56 Darren O'Day RP

O'Day (hamstring) underwent successful surgery Thursday, Roch Kubatko of MASN Sports reports.

O'Day is set to miss the rest of the 2018 season after having surgery on his hamstring. The procedure went well, and he'll attempt to return to form for the start of the 2019 campaign.

O'Day (hamstring) will have surgery on his left hamstring and will miss the rest of the 2018 season, Rich Dubroff of PressBoxonline.com reports.

O'Day landed on the disabled list earlier this week with a hamstring strain and was moved to the 60-day disabled list Friday, which makes sense given the surgery announcement. The 35-year-old would have been eligible to return in late August, but will now have to look towards a return in 2019.

O'Day (hamstring) was transferred to the 60-day disabled list Friday.

It's now clear that the hamstring strain O'Day suffered Tuesday against the Mariners is a serious one. He'll be ineligible to return before August 26, though a precise timeline for his return has not yet been made clear.

O'Day was placed on the 10-day disabled list Tuesday with a hamstring injury, Brittany Ghiroli of MLB.com reports.

O'Day aggravated his hamstring injury Tuesday when attempting to field a bunt in the eighth inning against the Mariners. The specifics of the hamstring setback haven't been revealed, so it's hard to say if he'll require more than just the minimum 10 days on the disabled list. More news on that front should become available in the coming days.

O'Day exited Tuesday's game against the Mariners with an apparent injury, Eduardo A. Encina of The Baltimore Sun reports.

O'Day threw six pitches in the eighth inning before being lifted from the contest after appearing to injure himself while attempting to field a bunt. The reliever recently missed some time with a hamstring injury, so it's possible that he may have aggravated that injury again. We'll wait for an official diagnosis following the conclusion of Tuesday's game.