PHILADELPHIA -- The Phillies entered Tuesday searching for stability.
They left with another question mark.
Before an 8-2 victory over the Miami Marlins at Citizens Bank Park, the Phillies placed right-hander Brad Keller on the 15-day injured list with right forearm tendinitis, removing one of the bullpen arms they expected to lean on heavily this season.
The move was made with the long view in mind.
Keller had been dealing with lingering discomfort and the Phillies decided the greater risk was allowing him to continue pitching through it. The organization does not believe the injury is serious, but in the middle of a season that has already featured uneven performances from several key relievers, losing Keller is significant regardless of the timetable.
The Phillies signed Keller to a two-year deal over the winter after he reinvented himself as a high-leverage reliever with the Cubs in 2025. The expectation was that he would help shorten games alongside Orion Kerkering and eventually hand leads to closer Jhoan Duran.
Instead, the first half of the season has been a struggle.
Keller owns a 4.15 ERA in 31 appearances, and while the results have fallen short of expectations, his role remained important. He was one of the few relievers on the roster with extensive late-inning experience, and the Phillies continued to use him in meaningful spots despite the inconsistency.
Now they must find those innings elsewhere.
Kerkering appears positioned to assume an even larger share of the setup responsibilities. Jonathan Bowlan has earned more trust in recent weeks and could see increased leverage opportunities. Chase Shugart and Max Lazar provide additional depth, but neither carries the established track record Keller brought to the bullpen.
The injury also shines a brighter light on a reality the Phillies have spent much of the season trying to solve.
For all of Jhoan Duran's dominance at the back end of games, getting the ball to him has often been an adventure.
Keller's struggles. José Alvarado's inconsistency. The revolving door of middle-relief options. Together, they have prevented the Phillies from developing the type of bullpen hierarchy many envisioned when spring training opened.
Tuesday's roster move served as a reminder that bullpen depth is rarely tested when everything goes according to plan. It is tested when a trusted arm suddenly disappears.
The Phillies recalled Lazar from Triple-A Lehigh Valley to fill Keller's roster spot, and the right-hander responded with a scoreless ninth inning in the victory over Miami. He struck out two and allowed one hit while helping secure the Phillies' 40th win of the season.
It was a solid first step.
But replacing Keller's roster spot is easier than replacing his role.
The Phillies can survive a short-term absence if the injury proves as minor as they hope. If it lingers longer than expected, however, the challenge becomes much larger.
The club entered the season believing it had assembled a bullpen capable of protecting leads deep into October.
For now, one of the arms central to that plan is unavailable.
And until Keller returns, the margin for error between the starting rotation and Duran just became a little thinner.
Then watched it disappear into the Philadelphia night.
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