In Week 4 of the 2025 fantasy baseball season, savvy managers are on the lookout for starting pitchers to enhance their rosters. This week features a mix of promising young arms and proven veterans. Mitch Keller of the Pittsburgh Pirates is recommended for his steady performance despite some inconsistency. Hayden Wesneski, recently traded to the Houston Astros, is showcasing potential with a strong strikeout rate, making him a must-add. Veterans Luis Severino and David Peterson provide reliable options for back-end rotation slots. For deeper leagues, Erick Fedde and Andrew Abbott are emerging as noteworthy picks, each showing solid statistical signs of potential breakout performances.