Sunday, February 8, 2026

DrB's 2026 Giants Top 50 Prospects: #7 Keyner Martinez

7.  Keyner Martinez RHP.   DOB:  8/16/2004.  6' 1", 165 lbs.  Rule 5 Eligible Dec. 2026.

2025(ACL):  3-1, 1.90, 47.1 IP, 12.74 K/9, 1.90 BB/9, 1.28 GB/FB.
2025(A):  2-1, 2.86, 22 IP, 12.27 K/9, 4.50 BB/9, 1.65 GB/FB.  

When Baseball America says you have the best fastball and best slider in the organization, how can you not be the top pitching prospect?  Martinez was a "pop-up" pitching prospect in 2025, dominated two levels and enters 2026 with big expectations.  The only issue with him is the pesky Rule 5 Draft.  Since he was 19 years old when he signed in 2023 he is eligible after 4 years.  He did not pitch in 2023 but that still counted as a year of service time so he's eligible at the end of this season.  If he remains healthy and continues to show premium stuff, The Giants will have to burn a 40-man roster spot to protect him.  Not that it's never been done but the Giants in recent years have been loathe to spend a roster spot on prospects who are still 2-3 years away.  If the stuff is for real, they might want to be aggressive with him, push him to A+ with the goal of having him finish the season in at least AA.

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