Gabriel Martinez is one of Fangraph's six sleeper hitters in 2023.
https://blogs.fangraphs.com/lets-identify-some-hitter-sleeper-candidates/
Gabriel Martinez, LF, Toronto Blue Jays
Relevant Stats: Martinez isn’t old enough to purchase alcohol in the United States yet (he’ll turn 21 this July). Despite his young age, he shredded A-ball and High-A last year, to the tune of an aggregate .299/.358/.485 line. He did so despite missing a month with injury, and in his first extended playing time as a professional to boot. Defensively, he’s corners-only in the outfield.
What I Like: Hitting. I like hitting, and Martinez does too. Working through two minor league levels at age 19 is impressive, and he did it not with some ludicrous BABIP but by controlling strikeouts and hitting for extra bases. Unlike many of the players on this list, he even hit some homers in a major league park (ish), since he played the majority of the season in Dunedin, the sometimes home of the 2021 Jays. Most players his age playing against advanced competition would be overmatched, which is easiest to see in their strikeout rate, but Martinez only struck out 16.4% of the time. Sure, the offensive bar to clear is higher as a corner outfielder, but he looked phenomenally good for his age and environment, which gives me hope that he can reach that bar.
Warning Signs: He’s another guy whose raw power numbers fall short of what you’d expect based on his production, and he’s on the clock to boot. He was Rule 5 eligible this past offseason, but I think it’s reasonable that no one took a chance on him; he’s just too raw to put on your major league roster without worrying about his long-term development. That does make 2023 a key season, though; he’ll be trying Double-A for the first time while also auditioning for a 40-man spot. That’s a lot of pressure, and might lead the Jays to push him too aggressively, though I think his skills are up to the challenge.