Hartman is the first minor leaguer to reach the 20-homer, 30-steal thresholds this season, needing just 71 games to get there. He’s the first hitter in Atlanta’s system to reach those marks since Ronald Acuña Jr. back in 2017. You’ve probably heard of him. The 20-year-old prodigy has boosted his long-term fantasy stock more than any prospect in baseball this year, skyrocketing from relative obscurity to an elite dynasty asset. He possesses off-the-charts athleticism, big-time power upside and elite speed, giving him a legitimate shot at fantasy superstardom if everything comes together.