Heading into Week 15 of the 2025 MLB season and the All-Star break, it's crucial for fantasy baseball players to evaluate their rosters and pinpoint underperforming hitters. This week, three players in each offensive category are highlighted as potential waiver wire additions that can help enhance your team's performance across various metrics.

For runs scored, Roman Anthony of the Boston Red Sox is hitting .429 recently and has added a home run, making him a hot pickup. Jake Meyers of the Houston Astros shows consistent scoring, while Ronny Mauricio of the New York Mets is finding his stride with dual eligibility at 2B/3B. In terms of home runs, Addison Barger of the Toronto Blue Jays is showing strong offensive metrics, alongside Ben Rice of the Yankees and Sean Murphy of the Braves, who appears ready for more playing time. If your squad needs RBIs, look to Romy Gonzalez, Mickey Moniak, and Joey Ortiz for boosts. For stolen bases, Evan Carter, Tyler Freeman, and Ha-Seong Kim could be game-changers. Lastly, for batting average improvements, consider Josh Smith, Colt Keith, and Mike Tauchman, who have all demonstrated significant hitting prowess recently.

The Kansas City Royals are set to debut their highly-touted prospect, Jac Caglianone, on Tuesday. Drafted 6th overall in 2024, Caglianone showcased impressive power in the minors, hitting 15 home runs in just 50 games across two levels. He has the potential to become a key offensive asset for the Royals, especially in a season where they struggle for scoring.

Fantasy managers should pay attention as Caglianone could rapidly rise to a top-10 first baseman this year, potentially hitting over 30 home runs in his first season, albeit with a likely low batting average. Comparisons with Matt Olson, known for his power and ability to draw walks despite high strikeout rates, further hint at Caglianone's bright future.

Dedniel Nuñez, once a promising pitcher for the Mets, has struggled to find his rhythm after returning to the majors this season. Following a series of inconsistent outings, he was sent back to Triple-A Syracuse to work on his command, having allowed six walks in his first appearance. Manager Carlos Mendoza emphasized the need for Nuñez to regain his strike zone consistency to replicate last season's elite performance.

In related news, left-hander Jose Castillo was added to the Mets roster after being acquired from the Diamondbacks, looking to bolster their bullpen. Castillo, who has battled injuries, is viewed as having potential upside. Meanwhile, infielder Ronny Mauricio has been optioned to Triple-A after completing a rehab assignment, focusing on adapting to daily play after recovering from knee surgeries. Paul Blackburn is also poised to make a final rehab start before returning to action.

The New York Mets have started the 2025 season strong with a 24-14 record, yet they face significant challenges due to injuries. Key players unavailable include infielder Ronny Mauricio and pitchers Frankie Montas, Sean Manaea, A.J. Minter, and Jesse Winker. Minter, who was enjoying a stellar season with a 1.64 ERA, recently revealed he requires season-ending surgery after tearing his lat off the bone. This development casts a shadow over the Mets' promising start as they attempt to maintain their top position in MLB with a remarkable team ERA of 2.84 despite these setbacks.

Manager Carlos Mendoza is under pressure to adjust his strategies given the lineup's injuries. The Mets are still finding ways to compete, but Minter's absence, in particular, is a significant blow to their bullpen. The team is now tasked with navigating the rest of the season while hoping for a speedy recovery for their injured stars, especially Minter, who aims to return for a normal spring training next year.

The New York Mets, fresh off a trip to the NLCS and bolstered by the acquisition of superstar Juan Soto, are on a promising trajectory. However, their minor league system has suffered a setback, slipping out of the top ten in Baseball America rankings for the first time since 2022. Injuries plagued key prospects like Jett Williams, Jesus Baez, Drew Gilbert, and Ronny Mauricio, hindering their development last season.

Despite this, there are bright spots in the Mets' farm system. Blade Tidwell, Nolan McLean, and Brandon Sproat represent the next wave of talent. Williams, the 1st-round pick in 2022, showcased potential but faced wrist surgery that limited him to just 33 games. Meanwhile, Sproat's solid performance on the mound could see him making his MLB debut soon, adding to the optimism around the Mets' future.