| Year | Team | G | IP | ERA | K | BB | WHIP | K/9 |
|---|---|---|---|---|---|---|---|---|
| 2022 | COL/PIT | 58 | 61.2 | 3.50 | 75 | 28 | 1.40 | 11.0 |
| 2023 | TB | 60 | 63.1 | 3.27 | 71 | 29 | 1.15 | 10.1 |
| 2024 | TB/LAA | 41 | 39.0 | 4.38 | 43 | 24 | 1.72 | 9.9 |
| 2025 (late) | LAA | 12 | 12.0 | 2.70 | 14 | 5 | 1.08 | 10.5 |
| 2026 ST | LAA | — | — | — | — | — | — | — |
Late 2025 Was Excellent. TOS Does Not Just Disappear.
Robert Stephenson's late-2025 stretch with the Angels was genuinely excellent — a 2.70 ERA across 12 outings, swing-and-miss stuff, and the kind of performance that makes a manager want to use him in high-leverage situations. The arm talent is real. The question is always the same one with Stephenson: how long can it last?
Thoracic outlet syndrome is a serious vascular condition that affects blood flow to the arm and hand. It does not resolve between seasons the way a muscle strain might — it is structural, it can recur, and it requires ongoing management. He threw a bullpen session on Feb 22 in camp, which is an encouraging early sign. But it is one bullpen session.
The talent justifies a roster spot and a role in high-leverage situations when he is right. The history demands contingency planning every time he takes the mound. That is the honest balance — not pessimism, not blind optimism, just accurate accounting of what thoracic outlet syndrome means for a pitcher's durability.