Alonso's arrival reshapes Baltimore's lineup. The Orioles actively seek trade partners for first base prospects Mountcastle and Mayo, eyeing pitching reinforcements.
The Baltimore Orioles have completely revamped their roster in the offseason, but they may not be done.
After signing five-time All-Star Pete Alonso to a five-year, $155 million dollar contract in December, Baltimore is still looking for potential trade suitors for two of their first basemen.
Baltimore understands that by signing Alonso, they are committing to him as their first baseman of the future, which leaves Ryan Mountcastle and Coby Mayo's future in Baltimore uncertain.
As of February 14, 2026, MLB insider Ken Rosenthal of The Athletic reported that Baltimore is continuing to shop Mountcastle and Mayo to other teams.
This news shouldn't come surprising for Baltimore fans, as many believe that Mountcastle and Mayo will have limited opportunities in 2026 due to their logjam at first base.
Alonso is expected to be Baltimore's everyday first baseman, with top prospect Samuel Basallo projected to play a bit of first base as well.
With the first base position locked down, moving away from one of Mountcastle or Mayo makes sense, especially is Baltimore can acquire a strong relief pitching in their return.
However, Mountcastle holds significantly less value than Mayo, as he is coming off a down year with only one-year of team control left.
In 2025, Mountcastle only appeared in 89 games for Baltimore, posting a .653 OPS with a 0.1 WAR. However, Mountcastle has arguably been one of Baltimore's best bats over the half decade, as he has posted an OPS+ of above 100 in five consecutive seasons prior to 2025.
Although Mountcastle struggled to stay on the field in 2025, his defense and hitting upside is worth a team taking a chance on him for this upcoming season.
The more attractive trade target for other teams is Mayo, as the 24 year-old has six years of team control left and projects as an above average major league hitter.
Mayo had a very up and down 2025 campaign, where he saw himself finish the season with a .687 OPS while hitting 11 home-runs and driving in 28 RBI's.
```Unlike Mountcastle, Mayo ended 2025 on a high note, posting a .301/.393/.548 slash line with five home-runs and eight RBI's in the month of September in 73 at bats.
Mayo's strong end to the season could make himself a more intriguing option for rebuilding teams who are looking for a high upside hitter with years of control.
Mayo would certainly fetch you a positive return, but Baltimore could be hesitant to trade away a former top prospect whose best years are ahead of him.
There are a few teams who have been in the market for a corner infielder, with the Pittsburgh Pirates being the most notable.
Pittsburgh has an abundance of young, controllable arms that could round out Baltimore's pitching rotation or bullpen.
Players such as Braxton Ashcraft, Hunter Barco and Mitch Keller could be potential targets for Baltimore if negotiations were to develop between the two sides.