Keyner Martinez

As of November 3, 2026, Prospect Card Radar rates Keyner Martinez’s 1st Bowman Chrome auto UNDERPRICED. His arm ranks in the 62nd percentile of 119 tracked prospect pitchers (3.27 FIP over 93.7 innings at Single-A), while his card market ranks in the 5th percentile, a 57-point gap in favor of production. Last sold value is about $5 raw and $53 in a PSA 10 (2026 Bowman Chrome Prospect Autograph #CPA-KMA). 25 base 1st autos are live on eBay, asking $6 to $45 (average $11). Prospect Card Radar reaches this by ranking every tracked prospect’s on-field production against the price of his 1st Bowman Chrome auto in the same pool of 119 prospect pitchers, and refreshing both daily.

As of November 3, 2026, Prospect Card Radar rates Keyner Martinez’s 1st Bowman Chrome auto UNDERPRICED. The gap between his on-field percentile (62nd) and his card market percentile (5th) is 57 points in favor of production. A player producing well above what his card is priced at is the pattern Prospect Card Radar flags as underpriced.

As of November 3, 2026, the sold value for a raw Keyner Martinez base 1st Bowman Chrome autograph is about $5, and about $53 graded PSA 10. This is a sold figure, not an asking price. Prospect Card Radar tracks it daily alongside live eBay asks so you can see the spread between what sellers want and what cards actually trade for.

The current Bowman Chrome 1st Bowman autograph average for Keyner Martinez is $11 based on live eBay listings tracked by Prospect Card Radar. Numbered parallels and refractor colors are excluded so the figure reflects base autos only. Data refreshes multiple times per day.

Current Bowman Chrome 1st auto listings for Keyner Martinez range from $6 to $45 based on live eBay data across 25 listings. The wider the spread, the more variation in condition and seller pricing.

Keyner Martinez is ranked #100 in the Prospect Card Radar composite top 300, which blends MLB Pipeline, Fangraphs, and Baseball America rankings (composite last recomputed September 19, 2026). Individual source ranks are listed at the top of his prospect page.

Keyner Martinez plays SP in the Giants organization.

Prospect Card Radar tracks live Keyner Martinez card listings, recently delisted cards, real sold values, and 30-day price history at https://prospectcardradar.com/prospects/keyner-martinez. Listings update continuously throughout the day.