MLB · P · Miami Marlins
William Kempner
B/T R/R · 6' 0" · 222 lb · born San Jose, CA, USA · age 25 · draft 2022 rd 3 · played P 33 · MLB debut 2026-05-05
Injured 60-Day · Right elbow sprain. (roster status, as of )
50 batters faced scored this season His season card →
Scout’s note
Kempner, a third-round pick out of San Jose, reached the majors this May at 25 and has nine appearances and fourteen strikeouts to show for it — not enough yet to tell us what he is.
Note written · FVR scout (GLM-5.2)
What he’s paid
Not statedA market fact, not an engine read: what a club decided about him, on the season before this one. Figures from Cot’s, as of .
- Service time
- 0 yr 105 d
- Options left
- 2 / 3
Cash and the tax hit are two different rulebooks and are never subtracted from one another — see the payroll board for his club, Miami Marlins.
A second set of books
The same contract, read by MLB Spreadsheets (Ethan Hullihen), as of . We keep two sources on this because one source cannot check itself.
- Tax AAV
- $0.78M
- Guaranteed
- $0.78M
- Term
- 1 yr
- His class
- Pre-Arb
What the sheet prices each season at
| Season | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 |
|---|---|---|---|---|---|---|---|
| Salary | Minimum | Minimum | Minimum | Minimum | Arb 1 | Arb 2 | Arb 3 |
A base salary under his own reading, and never subtracted from the cash figure above: a signing bonus lands in one and not the other, so the two disagree on most men without either being wrong. And the sheet does not mark which future seasons are GUARANTEED — a club option and a projected arbitration award are both just a number here, so read past the end of the deal as his forecast rather than as money owed.
The tax AAV above is his number under the CBA’s own rulebook, not the average we work out from Cot’s total. On a contract with deferred money the two come apart on purpose — and neither is subtracted from the other.
Collect William Kempner
If the signal is right, the cardboard usually finds out later. Current listings:
William Kempner cards on eBay →Paid link — as an eBay Partner, FVR earns from qualifying purchases.
Umpire favor
-0.1 net runs over 5 graded games — an even shake from the zone this season.
The line
Bio & season lines: MLB StatsAPI · refreshed nightly · abbreviations →