Mitch Keller: keep, trade, or add a starter
The question
Do we trade Mitch Keller's contract, keep him, or keep him and add a starter?
Recommendation
Confidence LowKeep him for now, medicals first; revisit once he is cleared (he ended 2026 on the 60-day IL). Under today's rules the trade saves $13.3M in 2027 dollars against 1.2 wins over 2027–2028 worth $10.9M: net $2.4M for trading, but a club gains from the terms only if his medicals are clean. With the floor money spent either way (the Free-Agent Board's list measured on each branch, on the owners' proposed terms), keeping him comes to 84.8 wins and trading him 85.0, a toss-up. Adding a mid-tier starter, Jack Flaherty, adds +1.0 to +1.1 wins: his price doesn't beat the market price of a win, so it waits with the floor money.
Decided together with “Spend to the floor” and “2027 starter hook and bullpen roles”; all read the same Winter Plan.
No clear lean between keeping and trading him: under today's rules the money leans to trading once his medicals clear, and with the floor money spent the two come out within 0.2 wins. The real risk is health: if he and Jones both miss the season the plan loses 2.9 wins.
Evidence
- The contract: $18.4M in 2027 and $20.4M in 2028 ($15.4M a year on the luxury-tax basis), against $21.8M of projected value (1.4 and 1.1 WAR): the salary runs $15.5M above his value in present value.
- Health: Ended 2026 on the 60-day IL (Right arm teres major muscle injury). The plan assumes he is ready for spring; that is a medical call we can't see.
- Every branch on the plan's roster: keep him, 81.7 wins (80% range 70–94), 44% playoff odds; trade him, 81.0 (−0.7); he opens on the injured list, 81.4 (−0.3); he and Jared Jones both miss the season, 78.7 (−2.9).
- The trade: Pittsburgh keeps half of each remaining season: $7.7M a year of his $15.4M luxury-tax hit in 2027, 2028. No player or prospect comes back in the model. It saves $6.9M of 2027 payroll on the luxury-tax basis ($7.7M less the ≈$780K minimum salary of the arm who takes his spot); $13.3M over 2027–28 in present value under today's rules. On the owners' proposed terms the club has to spend up to the floor anyway, so the saving is worth $0 with the floor money free, $12.9M at face value.
- Would a club take him on those terms? It gains $3.1M of surplus under today's rules if he is healthy, −$188K if he opens on the injured list ($502K and −$2.4M on the owners' proposed terms at face value; the acquiring club's payroll against the floor isn't modeled), so the trade works only once his medicals are clean.
- Keep him and add a mid-tier starter: Jack Flaherty (2 yr × $10.8M) adds +1.0 wins with the plan's rotation rule (82.7, $148.6M payroll), +1.1 with Keller moved to the bullpen (82.8). The plan's 40-man is already full at the Rule 5 filing (Nov 17), so a signing before it needs one more spot: acquire Isaac Paredes first.
- Results: ERA 5.29 in 2026 against a 4.54 FIP and 4.61 xFIP; ERAs of 4.25 and 4.19 in 2024–25. Keystone Stuff 93.
- Velocity: his four-seamer averaged 94.5 → 94.1 → 93.3 mph (2024–2025–2026); leaving out the 4 starts in the month before his IL stint he sat 93.4, 0.5 mph short of 2025 after typical aging.
- His hook (Bullpen Strategy, the pitching-usage brief): two times through, an 18-batter leash (about 66 pitches) that hands the pen about 29 innings and saves 3.3 ± 1.6 runs a season. The plan's 128 innings for him come before that hook (about 29 of them move to the pen with it); it doubles as the workload plan for his return from the IL.
Options considered
| Option | Upside | Downside |
|---|---|---|
| Keep himRecommended | Sells nothing at his lowest value; the trade stays open once he is healthy | $18.4M of 2027 salary; $15.5M above his value over the contract |
| Trade him, keeping half his salary | Saves $6.9M of 2027 payroll (worth $0 with the floor money free, $12.9M at face value on the owners' proposed terms) | −0.7 wins; a club gains only if he is healthy (−$188K to it if not) |
| Keep him and sign Jack Flaherty | +1.0 to +1.1 wins; covers a Keller or Jones injury | $10.8M a year for 2 years; if he signs before the Rule 5 filing, also acquire Isaac Paredes first |
Risks
- The arm injury may cost velocity for good; spring readings are the first test.
- If he opens on the injured list, 35 starter IP go to replacement level.
- Most of the gap is contract, not pitching: even a full recovery leaves him paid above his projected value.
What would change our mind
If a club offers to take at least half of the remaining $38.8M for modest talent once his medicals clear, or his fastball in his first April starts sits below 93.4 mph (spring readings run low and don't count).