Player checklist
William Kempner
Miami MarlinsP#71
Find William Kempner baseball cards by year, product and card type.
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Player profile & stats
- Bats
- R
- Throws
- R
- Born
- San Jose, CA, USA
- MLB debut
- 2026-05-05
2026 Season
- G
- 9
- W
- 1
- L
- 0
- ERA
- 2.92
- SO
- 14
- WHIP
- 0.97
Career
- G
- 9
- W
- 1
- L
- 0
- ERA
- 2.92
- SO
- 14
- WHIP
- 0.97
Card overview
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4Products
Cards by year
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Card checklist
Explore every listed product in one place
6 of 6 cards · 4 products
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2026 Topps Update Series Baseball 2 cards
2026View checklist
| # | Set | Team | eBay |
|---|---|---|---|
| US14 | ROOKIE GOLDEN MIRROR VARIATIONRCBase | MIA |  Find this card on eBay |
| US14 | ROOKIESRCBase | MIA | Find this card on eBay |
2022 Bowman Draft 2 cards
2022View checklist
| # | Set | Team | eBay |
|---|---|---|---|
| BD-3 | BASE CARDS1stBase | SF | Find this card on eBay |
| BDC-3 | CHROME BASE CARDS1stInsert | SF | Find this card on eBay |
2022 Bowman Draft 1st Edition 1 card
2022View checklist
2022 Bowman Draft Sapphire 1 card
2022View checklist
William Kempner card index (6 cards across 4 products)
2026 Topps Update Series Baseball (2)
- #US14 ROOKIE GOLDEN MIRROR VARIATION
- #US14 ROOKIES
2022 Bowman Draft (2)
- #BD-3 BASE CARDS
- #BDC-3 CHROME BASE CARDS
2022 Bowman Draft 1st Edition (1)
- #BD-3 BASE CARDS FIRST EDITION
2022 Bowman Draft Sapphire (1)
- #BDC-3 BASE CARDS