William Kempner — Common 63 OVR Relief Pitcher Overview
William Kempner is a Common 63 OVR Relief Pitcher card for the Free Agents, part of the Live set in MLB The Show's Diamond Dynasty. He throws right-handed. The card was added to Diamond Dynasty in April 2026.
On the mound, William Kempner works with a 4-pitch arsenal led by a 95 mph 4-Seam Fastball and a 92 mph Sinker. His pitching ratings include 80 Velocity, 52 Control, and 58 Break. The profile favors a balanced mix of command and movement.
DiamondOps grades each pitch in William Kempner's arsenal: Slider (S), 4-Seam Fastball (S), Sinker (S), and Changeup (B). 3 of them grade S-tier, which is what separates a genuine out-pitch mix from a deep-but-flat arsenal. Its strongest tunnel pairing is the 4-Seam Fastball off the Sinker, so the two share a release look. Velocity works against the card here — its 80 mph Sinker is slow enough to cost it in the arsenal score. Arsenal grades are the same at every difficulty — unlike a hitter's OpScore, a pitch mix does not re-weight as you climb.
On the Diamond Dynasty market, William Kempner currently buys for about 7 stubs, with sell orders near 0 stubs. Over the past 7 days the buy price has fallen roughly 88%. Its quick-sell value of 5 stubs sits at or above the sell price, making it quick-sell viable. DiamondOps currently rates the card a buy at this price.
OpScore is DiamondOps' composite rating of a card's in-game performance value. William Kempner earns an OpScore of 52.2 on Legend difficulty, ranking #2635 among all cards and #501 among Relief Pitchers.
Live Series cards like William Kempner's are the ones Diamond Radar scores: it reads a player's real MLB production and predicts what the next roster update will do to the card — the predicted rating, the tier jump, and how likely the upgrade is. Ratings only move at a roster update, and not every Live Series card is scored in a given window. Across the season so far, 55% of the cards Radar flags go on to be upgraded, against a 26% background rate across all scored cards — 2.1× better than chance (n=1,061).
Common questions
- What is William Kempner's overall rating in MLB The Show 26?
- William Kempner is a 63 OVR Common Relief Pitcher for the Free Agents.
- Is William Kempner a good card in MLB The Show 26?
- Among Relief Pitchers, William Kempner ranks #514 on All-Star, #498 on Hall of Fame, and #501 on Legend by OpScore — DiamondOps' difficulty-aware rating: it weights the attributes that decide at-bats and recomputes them for each difficulty, whereas in-game Overall is a single number that does not change with the level you play on.
- How much does William Kempner cost in Diamond Dynasty?
- The last recorded buy-now price was 7 stubs. Prices move constantly on the in-game marketplace — the chart on this page tracks the card's real history rather than a single snapshot.
Where to go next
Every link below comes from this card's own series, team, rarity, position, or the collections and programs it belongs to.
- Starter — Collect Common PlayersA collection this card counts toward.
- Best Relief PitchersThe top relief pitchers in the game, ranked by OpScore.
- Live CardsEvery Live card, filterable by position, team and rating.
- Free Agents CardsEvery Free Agents card in the game, with live market prices.
- Common CardsEvery Common card, ranked by overall rating.
- Live Series CardsLive Series prices move on real-world performance, so they are the only cards where following actual MLB box scores is a trading edge.
- Live Series CommonsWhen a Common costs meaningfully more than its quick-sell price, a collection or mission is driving it — the card itself is not the reason.
- Diamond RadarWhich cards our model predicts will be upgraded at the next roster update.
