Glasnow underwent successful Tommy John surgery Wednesday, Marc Topkin of the Tampa Bay Times reports.
Glasnow was initially hoping that he'd be able to return in 2021 after he suffered a partial UCL tear in mid-June, but he'll likely be sidelined until 2023 following Wednesday's procedure. Prior to his injury, the 27-year-old put up a 2.66 ERA and 0.93 WHIP in 88 innings across 14 starts.