Fantasy baseball enthusiasts should keep a keen eye on three rising prospects this season: Coby Mayo, Quinn Mathews, and Andrew Painter. Mayo, the highly touted Orioles third baseman, has struggled since his brief stint in the majors but remains a player to watch. Meanwhile, Mathews, a left-handed pitcher for the Cardinals, is showing promise in Triple-A despite recent command issues. His potential to join the St. Louis rotation makes him a worthy stash. Lastly, Painter, a top pitching prospect for the Phillies, is returning from injury and is set to make his minor league debut soon. With high ceilings, all three players could be critical additions for savvy fantasy managers looking to bolster their roster.