The opening month of the minor league season is officially in the books and the next wave of potential future fantasy superstars is starting to take shape with a trio of shortstop prospects — Leo De Vries, Jesús Made and Konnor Griffin — making headlines in the lower minors. There’s going to be plenty of time to chronicle their exploits in Rotoworld’s electronic pages in the coming months. However, this weeks’ column focuses on a handful of hitting prospects that are poised to make significant jumps in our next dynasty rankings update including Bryce Rainer, Eduardo Tait, C.J. Kayfus, Arjun Nimmala and Slade Caldwell.
Bryce Rainer, SS, Tigers
Rainer has been overshadowed by early-season exploits from De Vries, Made and Griffin in the lower minors, but he’s putting together an extremely impressive professional debut, even if the raw surface stats don’t exactly leap off the page. The 19-year-old was selected 11th overall in the 2024 MLB Draft and is hitting .205/.340/.410 with two homers and a pair of steals through 12 games for Low-A Lakeland. There’s reason for optimism if we take a deeper look under the hood. According to Baseball America’s Eli Ben-Porat, Rainer has displayed an impressive blend of elite exit velocity, including a 114-mph batted ball during spring training, and better than anticipated swing decisions and contact skills. He's a below-average runner, and the hit tool questions are going to persist, but it’s easy to project him as Detroit’s long-term answer at shortstop with the ability to make an impact for fantasy purposes as a power-oriented contributor. He’s going to be one of the biggest risers in the dynasty landscape by the time midseason updates come around.
Eduardo Tait, C, Phillies
Here’s an oversimplification: Catchers are weird from a developmental standpoint. There are so many variables to consider when rostering backstops in dynasty formats, but Tait is making some waves in the lower minors with an astonishing six round-trippers through 18 games at Low-A Clearwater, which is tied with Blue Jays shortstop Arjun Nimmala (we’ll get to him in a moment) for the most in the entire minors among players in their age-19 season or younger. There’s absolutely some work to be done from a swing decision standpoint since he’s still striking out 20 percent of the time in the lowest rung of full-season ball. However, it’s an extremely encouraging sign that he’s starting to get to his massive raw power more frequently in games. Per Baseball America, Tait recorded a stellar 103 mph 90th percentile average exit velocity last year in a 28-game cameo at Low-A after demolishing the Rookie-level Florida Complex League. He’s extremely far from the big leagues, but the 18-year-old prodigy is positioning himself as one of the better fantasy prospects at the position for dynasty purposes.
C.J. Kayfus, 1B, Guardians
Kayfus didn’t waste any time following a promotion to the doorstep of the majors earlier this week, going 2-for-5 with a solo homer on Wednesday night in his first contest for Triple-A Columbus. The 23-year-old left-handed slugger compiled a robust .364/.475/.591 triple-slash line with nine extra-base hits over 18 games at Double-A Akron to earn a lightning-quick call to Triple-A. The 23-year-old first baseman was a third-round pick in the 2023 MLB Draft and is starting to display more pull-side power than he did over the last couple year after putting in some extensive offseason work on his body.
“He put a lot of time in this offseason on the physical side,” Guardians vice president of player development Stephen Osterer told MLB.com last week. “I think we saw that transfer into some of his movements in his swing, and then the idea is to continue to impact the ball, and he's already done that. We're seeing a really locked in version of him, in a great physical spot, and obviously off to a hot start.”
The early-season results are further evidence that the offseason work to add additional thump is paying dividends for Kayfus, who could potentially arrive in Cleveland at some point later this year. He’s put himself in the top-20 range at first base for dynasty purposes and has the potential to rise even higher if he continues adding over-the-fence power.
Arjun Nimmala, SS, Blue Jays
It’s not a knock on Nimmala at all that he’s a notch below the Walcott, De Vries, Made and Griffin quartet from a pure upside standpoint for dynasty purposes. The 19-year-old phenom, who was selected 20th overall in the 2023 MLB Draft, went deep in three straight games last week and is up to five round-trippers in 20 games for High-A Vancouver, which is tied with Phillies backstop Eduardo Tait for the most of any player in the minors their age-19 campaign or younger. He recorded his second three-hit performance of the season on Wednesday and is batting .294/.362/.541 with 11 extra-base hits through 20 games. The fact that he’s cutting back on the strikeouts is an extremely encouraging development after whiffing roughly 30 percent of the time last year at the same level. He projects as a power-oriented shortstop, which gives him a chance to make a serious fantasy impact down the road, especially if he continues to add strength as he matures physically.
Slade Caldwell, OF, Diamondbacks
The Diamondbacks have quietly been one of, if not the best, offenses in baseball over the past two seasons and they have some help coming on the horizon with Jordan Lawlar, Demetrio Crisantes, Ryan Waldschmidt and LuJames Groover looking like impactful hitters. The 29th pick from the 2024 MLB Draft, Caldwell looks like the real X-factor in Arizona’s system, hitting .308/.511/.554 with 11 extra-base hits and four steals through 20 games for Low-A Visalia. The 18-year-old outfielder is a bit on the shorter side but still manages to hit for a decent amount of power to the pull side thanks to an extremely quick and compact swing. He's an above-average runner, which is going to translate to lofty stolen base totals, and he has a chance to be a legitimate five-category impact fantasy contributor down the road. There aren’t really any holes in his game if he’s going to continue barreling everything once he reaches the upper minors. He’s not flashy, but he’s the type of prospect that could make a significant fantasy impact down the road.