| Player: Keyner Martinez | |||||||||||
| Org: San Francisco Giants | Highest Level: Single A | Position(s): RHP | |||||||||
| Height: 6’1″ | Weight: 209 lbs. | Bats: Right | Throws: Right | ||||||||
| Summary: Working from a low three-quarter slot with good leg drive, Martinez generates easy plus velocity with a fastball that sits 95-97 and plays with heavy arm-side life from the first base side of the rubber. The slider is the separator — a true plus out pitch with sharp two-plane action that has emerged as his primary weapon and the pitch that makes the profile go. A changeup in the mid-to-upper 80s gives him a third option with chase and whiff ability against left-handed hitters, though it still trails the fastball-slider combination in consistency. The developmental trajectory has been steep and encouraging. Rapid improvement after a raw debut, strong strike-throwing relative to his age, and growing confidence in sequencing all point to a pitcher who is figuring it out quickly. The command profile has improved alongside the stuff, though fastball command lapses and a heavy reliance on the slider raise questions about the ability to navigate a lineup multiple times as he climbs. The starter path is still alive if the changeup develops into a reliable third weapon and the fastball command tightens, but the profile trends toward a high-leverage bullpen role where the fastball-slider combination can operate at full intensity without the demands of a full rotation workload. Either outcome represents a useful big league arm. | |||||||||||
Shaun Kernahan is the founder and lead writer of Three Quarter Slot, where he blends scouting precision with a storyteller’s eye for the human side of the game. Based in Parker, Colorado, he has covered baseball prospects at every level since 2013, delivering in-depth evaluations, draft analysis, and developmental insight. Over the years, he has built Three Quarter Slot into a trusted home for thoughtful prospect coverage, detailed scouting reports, and a grounded look at how talent evolves
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