Manaea was emerging as the ace of Oakland’s staff when he hit the injured list with a left shoulder impingement in late August of last season. Eventual shoulder surgery has kept him behind the scenes of the 2019 season until now. At the time of the injury, Manaea had made 27 starts, going 12-9 with a 3.59 ERA/4.26 FIP across a career-high 160 2/3 innings.
He has been on a rehab assignment since early July where he appears back to his old tricks. In eight starts across High-A and Triple-A, he’s notched 13.1 K/9 while yielding 2.5 BB/9 and an overall 4.71 ERA.
The A’s currently field a veteran-laden, if starless rotation featuring Mike Fiers, Tanner Roark, Chris Bassitt, Brett Anderson, and Homer Bailey. A healthy Manaea should certainly buoy this group, as will the potential addition of prospect Jesus Luzardo at some point in September, though Oakland plans its September additions “to come in waves,” per Susan Slusser of the San Francisco Chronicle (via Twitter).
Fiers/Roark/Bassitt/Anderson boast ERAs that are a combined 3.98 runs lower than their relative FIPs, though whatever dark arts the quartet are engaged in, they’ve not shared with likely odd-man-out Bailey. With a 5.52 ERA/4.02 FIP in 8 starts since joining Oakland, Bailey is the only one of the five whose ERA has underperformed relative to his FIP. He’ll get at least one more start today, but the A’s could very well use the additional roster space to give each of their veteran hurlers an extra day of rest.