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.

As injuries plague MLB rosters early in the season, fantasy managers face tough waiver wire choices. Geraldo Perdomo of the Arizona Diamondbacks has emerged with a hot start, boasting a .333 average and some power, but his historical performance suggests caution. Zac Veen, called up by the Rockies, showcases enticing speed yet struggles with a high strikeout rate, making him a risky add. Meanwhile, Mitch Keller of the Pirates delivered a stellar outing but maintains a mediocre ERA, hinting at inconsistency. Managers must weigh the potential against the pitfalls when navigating these popular players on the waiver wire.

For fantasy baseball enthusiasts looking to bolster their pitching staff, several intriguing streaming options are available for the upcoming week. Jeffrey Springs of the Athletics is set to face the White Sox and Brewers, showing promise with his increasing velocity. Grant Holmes, also rostered at 73%, faces favorable matchups against the Blue Jays and Twins, despite previous efficiency issues. Chaos characterizes Mitch Keller's outings with the Pirates, yet his potential for high strikeouts can be enticing with two starts against the Nationals and Guardians. Keep an eye on Tylor Megill of the Mets; he’s been solid this season, albeit with uncertainty about a second start.

Tomoyuki Sugano has shown efficiency for the Orioles and could benefit from a weak Guardians batting lineup. JP Sears of the Athletics, currently at 27% rostered, is worth a flier, especially against the struggling White Sox. Landen Roupp has swing-and-miss potential and would be a good addition in points leagues. Finally, Richard Fitts boasts quality starts and might emerge as a sleeper against the White Sox. As we enter this scoring period, these pitchers present a variety of opportunities for fantasy managers.

The Pittsburgh Pirates secured their first win of the season, triumphing over the Miami Marlins 4-3 at loanDepot Park. Mitch Keller delivered a commendable starting performance, which paved the way for a thrilling finish. Oneil Cruz showcased his power with a two-run homer, further bolstering the Pirates' offensive efforts. David Bednar managed to close the game, despite some nerves in the ninth inning, marking his first save of the season.

Looking ahead, the Pirates aim for consecutive victories with Bailey Falter slated to start for them against the Marlins again. Falter, starting his second full season with the Pirates after joining from the Philadelphia Phillies, had a mixed bag last year with an 8-9 record and a 4.43 ERA over 28 starts. As the season progresses, fans are eager to see how Falter adapts and performs in this crucial matchup.

Oneil Cruz rebounded from a tough defensive performance with a powerful display, hitting a home run and contributing to a two-hit game against the Miami Marlins. The Pittsburgh Pirates secured their first victory of the season with a nail-biting 4-3 win, highlighted by solid pitching from Mitch Keller, who delivered a strong outing. The Pirates broke the deadlock in the fourth inning, thanks to Andrew McCutchen's timely double, allowing Cruz to score. An errant play by the Marlins further helped the Pirates extend their lead.