Mets Right-Hander Robert Stock Faces Thoracic Outlet Syndrome Surgery
New York Mets right-hander Robert Stock has been diagnosed with thoracic outlet syndrome (TOS) and is scheduled to undergo surgery, as he informed reporters on Sunday, March 8, 2026. The diagnosis comes after experiencing discomfort in his shoulder following a start for Team Israel in an exhibition game against the Marlins.
Understanding Thoracic Outlet Syndrome in Baseball
Stock is suffering from arterial TOS, the rarest form of the disorder. Even as increasingly familiar to baseball fans, TOS often gets confused with neurogenic and venous forms, which have sidelined players like Stephen Strasburg, Chris Archer, and Zack Wheeler in recent years. Arterial TOS impacts the arteries beneath the collarbone, potentially restricting blood flow to the arm.
Stock’s Career Trajectory
The 36-year-old Stock has appeared in parts of five MLB seasons. He initially made a strong impression with the Padres in 2018, posting a 2.50 ERA in 39 2/3 innings. Though, his performance declined in subsequent seasons, with a 7.57 ERA over 35 2/3 innings since then. After stints in the KBO, minor leagues, and independent leagues, Stock returned to affiliated ball with the Red Sox in 2025, pitching decently at Triple-A Worcester.
Mets Depth Can Absorb the Loss
Stock signed a minor league deal with the Mets heading into 2026 and was expected to provide versatile depth. Despite the setback, the Mets appear well-equipped to handle his absence. Justin Hagenman, Christian Scott, and Jonathan Pintaro are all rotation depth options already on the 40-man roster. Top prospect Jonah Tong also represents a future option.
Bullpen Strength Remains
The Mets also boast a deep group of non-roster invitees to bolster the bullpen, including Craig Kimbrel, Adbert Alzolay, and Kevin Herget.
Potential for Return in 2026
Stock has indicated a possibility of pitching again before the conclude of the year, though his recovery timeline remains uncertain given the nature of the surgery and the rarity of arterial TOS.
Frequently Asked Questions
What is Thoracic Outlet Syndrome?
TOS is a condition that affects the space between your collarbone and your first rib. It can compress nerves, arteries, or veins, causing pain, numbness, and other symptoms.
Is TOS common in baseball players?
While not extremely common, TOS appears to be more prevalent in baseball players due to the repetitive overhead motions involved in pitching and throwing.
What is the recovery process like for TOS surgery?
Recovery varies depending on the type of TOS and the surgical approach. It can seize several months to a year or more to fully recover.
What are the different types of TOS?
Notice three main types: neurogenic (affecting nerves), venous (affecting veins), and arterial (affecting arteries). Arterial TOS is the rarest and often most severe.
How will the Mets manage without Stock?
The Mets have several depth options in both their rotation and bullpen, allowing them to cover Stock’s absence without significantly impacting their roster.
