As the 2025 MLB season unfolds, several rookie prospects have made an impact after being called up. Chandler Simpson, an outfielder for the Tampa Bay Rays, has shown promise with his speed, recording two stolen bases in just 15 plate appearances. Nick Kurtz from the Athletics debuted strongly, hitting a home run and showcasing excellent plate discipline that could translate well in fantasy leagues. Luke Keaschall, a versatile infielder for the Twins, has already stolen five bases, indicating significant speed potential. Miami's Agustin Ramirez adds intrigue as a catcher with unexpected speed, while Caleb Durbin of the Brewers shows promise in batting average and stolen bases. Notably, Roman Anthony (Red Sox) and Bubba Chandler (Pirates) are prospects to keep an eye on for future call-ups.

As the MLB season progresses into Week 4, savvy fantasy players are scouring the waiver wire for potential impact picks. Notable additions include Austin Hays, who is on fire with a .361 batting average, three homers, and nine RBIs in his last nine games. The Athletics have called up Nick Kurtz, who made an immediate impact with an RBI single in his debut, and the Marlins' Agustin Ramirez is off to a hot start after hitting 5-for-6 with three doubles in his first two games. With injuries piling up, especially for the Texas Rangers, these players could provide essential depth to fantasy rosters as they look to capitalize on emerging talent.

Agustin Ramirez, the Miami Marlins' top catching prospect, has made headlines with his impressive rise in the minor leagues, culminating in his much-anticipated call-up. Initially drafted as a utility player, Ramirez showcased his significant potential during the 2023 season, hitting .271 with 18 home runs and 69 RBIs across multiple levels. His performance only improved in 2024, where he achieved a remarkable 20-20 campaign, emphasizing his rare combination of power and speed.

In his first two Major League games against the Cincinnati Reds, Ramirez has continued to impress, accumulating five hits—including three doubles—and showing his capability to excel at the highest level. His remarkable start positions him as a player worth considering for fantasy leagues, especially in the shallow catcher market, where his blend of power and speed could make him a valuable asset for years to come.

As we approach the Super-2 threshold on May 9, 2025, fantasy managers need to keep an eye on key MLB prospects who could make an impact this season. Agustin Ramirez has been called up by the Miami Marlins, bringing power and speed potential that could redefine the catching position in fantasy leagues. With 25 home runs and 22 steals last year in Double-A, he provides a unique blend of skills. In addition, Jordan Lawlar of the Arizona Diamondbacks is on fire in Triple-A, boasting a .410 batting average and multi-positional versatility, making him a must-add in deeper formats.

On the pitching end, Bubba Chandler has been dominant in Triple-A, potentially the best pitching prospect poised for a call-up. However, Matt Shaw's early struggles with the Chicago Cubs might have fantasy managers reconsidering their holds on him. Overall, stashing these prospects could pay dividends as the season progresses, especially with several promotions expected before the Super-2 deadline.

Week 4 of Fantasy Baseball features exciting prospects worth stashing as call-ups loom. Key prospects include Nick Kurtz of the Athletics, who boasts a staggering 176 WRC+ and leads the minors with seven homers, suggesting he’s ready for a major league opportunity. Roman Anthony from the Red Sox is also a top pick, showcasing advanced plate discipline and a 161 WRC+ this season, potentially providing the spark the struggling Red Sox need.

Power-hitting Coby Mayo of the Orioles has had a strong showing in Triple-A with three homers in the last week, but faces competition for a call-up. Agustin Ramirez of the Marlins, with impressive power-speed potential, remains a sleeper due to the team's current catching situation. Lastly, Jordan Lawlar of the Diamondbacks could capitalize on a roadblock in their lineup as he continues to excel at Triple-A, but his future is uncertain with Ketel Marte's imminent return.