As the 2025 MLB season heats up, Week 4's fantasy baseball waiver wire offers several intriguing outfielders worth considering for your roster. Tyler Fitzgerald of the San Francisco Giants has been on fire, showcasing a .444 batting average with two home runs and six RBIs in his last seven games. His dual eligibility at OF, 2B, or SS makes him a valuable pick-up for those looking to capitalize on his hot streak.

Similarly, Sal Frelick from the Milwaukee Brewers is excelling with a .319 batting average and five steals, making him a solid volume play. Meanwhile, Houston Astros rookie Cam Smith is building on his momentum, having recently notched his first multi-homer game. For deeper leagues, Austin Hays and Heston Kjerstad are generating buzz with power potential, while Mike Yastrzemski offers a temporary boost due to favorable matchups.