"Good start for him, and he felt good afterward," said manager Bob Melvin, "so that's important."
It doesn't mean he's ready to join the big league club just yet, though. O'Flaherty will continue his rehab on a Spring Training-like progression, so it's likely he makes at least five more Minor League appearances.
Melvin, however, doesn't believe he'll need to pitch on consecutive days, like most clubs have their relievers do in advance of the season, so it's plausible O'Flaherty's return could still come before month's end.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.