With the arrival of September, Major League Baseball (MLB) teams are allowed to expand their rosters from 26 to 28 players, with the stipulation that only one of the new additions can be a pitcher. This change, while less generous than in previous years, still provides teams with valuable opportunities to assess talent and bolster their playoff pushes. The additional roster spots can be pivotal for both contenders and rebuilding teams alike as they navigate the final stretch of the regular season.
This September, several noteworthy players have been called up, and their performances could significantly impact their respective teams. Here are ten call-ups to watch closely as the month unfolds.
Ethan Salas, San Diego Padres
At just 20 years old, Ethan Salas has quickly become one of the most exciting prospects in baseball. The catcher, who signed with the Padres as an international free agent in January 2023 for a staggering $5.6 million, has faced his share of challenges, including injuries that limited his play in 2025. However, after a strong showing at Double-A and Triple-A this season, Salas has made his major league debut, becoming the youngest player in the league. His arrival comes at a crucial time as the Padres vie for a wild-card spot in the National League, and Salas's performance could be a key factor in their postseason aspirations.
Will Smith, Los Angeles Dodgers
Will Smith has been a cornerstone of the Dodgers’ success in recent years, but he faced a setback this season due to neck inflammation that sidelined him since early June. Activated just in time for September, Smith’s return is vital for the Dodgers, who have struggled offensively. While he aims to regain his defensive rhythm, his offensive capabilities will be crucial as the team prepares for October. Despite a challenging season at the plate, Smith's underlying metrics suggest he could be poised for a resurgence.
Lazaro Montes, Seattle Mariners
Making an immediate impact in his major league debut, 21-year-old Lazaro Montes hit a home run in his first game with the Mariners. The Cuban outfielder brings a much-needed spark to a Seattle team that has struggled recently. Known for his power and infectious personality, Montes could provide both energy and offensive production as the Mariners look to turn their season around.
Ronel Blanco, Houston Astros
After recovering from Tommy John surgery, Ronel Blanco has been recalled to the Astros as they seek stability in their rotation. Following a rocky rehabilitation stint, Blanco showed promise in his first game back, throwing four scoreless innings. With the Astros in contention for the American League West title, Blanco's performance could be crucial in their quest for a postseason berth.
Kyren Paris, Los Angeles Angels
Once viewed as a potential star, Kyren Paris has faced difficulties this season. After a promising start, he struggled at the plate, leading to a demotion. However, following a successful stint in Triple-A, Paris has been called back up. The Angels will be looking to integrate him into their lineup as they assess his future with the team.
BJ Murray Jr., Chicago Cubs
Making history as one of the few players from the Bahamas to reach the majors, BJ Murray Jr. made his debut with the Cubs this week. Primarily a first and third baseman, Murray’s switch-hitting ability adds depth to the Cubs' bench, and his performance could earn him more playing time as the season progresses.
Tommy Pham, Chicago White Sox
Returning to the White Sox after a tumultuous tenure with several teams, Tommy Pham brings veteran experience to a young squad pushing for a division title. His presence in the clubhouse and on the field could provide the leadership necessary for the White Sox as they navigate the final weeks of the season.
Bo Naylor, Milwaukee Brewers
After being traded to the Brewers, Bo Naylor has been recalled to provide depth behind the plate. With star catcher William Contreras ahead of him in the depth chart, Naylor’s role may be limited, but he could still contribute as a left-handed bat off the bench.
John Schreiber, New York Yankees
Claimed off waivers, John Schreiber adds experience to the Yankees’ bullpen as they look to solidify their relief corps. Known for his ability to generate weak contact, Schreiber could play a vital role in the Yankees' efforts to improve their pitching depth as they aim for a playoff spot.
Leo Bernal, St. Louis Cardinals
Finally, Leo Bernal joins the Cardinals after a successful run in Triple-A. With the Cardinals experimenting with their catching depth, Bernal's performance could be pivotal as they look to solidify their roster for the remainder of the season.
As these players make their mark in September, their contributions could be crucial for their teams as they aim for postseason success.
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