Week 4 of the 2025 fantasy baseball season brings a spotlight on standout prospects and rookies poised to make an impact. After impressive performances in the minors, key players like Coby Mayo, Moises Ballesteros, and Ian Seymour are generating buzz among fantasy managers. Mayo, the Baltimore Orioles' third baseman, is rebounding from a rocky MLB debut, showcasing powerful hitting in Triple-A with a .343 average and three home runs. Chicago Cubs catching prospect Ballesteros is also catching attention with a .379 batting average, exhibiting potential in a crowded lineup. Meanwhile, Rays pitcher Seymour has displayed elite strikeout capabilities, hinting at a possible MLB promotion. Evaluating these prospects can be pivotal in shaping teams for a championship run.