The Philadelphia Phillies boast one of the deepest rosters in Major League Baseball, but even elite teams have areas of concern. For the Phillies, that concern this season has been the performance of their fifth starter, Taijaun Walker. Walker has struggled to deliver consistently for Philadelphia, and his poor outings have become a key issue early in the 2027 campaign.
In two starts this season against the Washington Nationals and Colorado Rockies—Walker posted a 9.31 ERA, highlighting the Phillies’ need for more reliable rotation depth. While the top of the rotation, anchored by right-handers Aaron Nola, Andrew Painter, and Zack Wheeler, remains solid, the fifth spot has become a glaring weakness. Walker’s struggles have prompted speculation that the Phillies may look externally for a short-term solution to stabilize their rotation.
One potential option comes in the form of left-handed free agent starter Nestor Cortez. According to Bleacher Report analyst Zachary D. Rymer, the Phillies are among a handful of teams that could provide Cortez with a landing spot this season. Rymer listed Atlanta and Houston alongside Philadelphia as potential destinations for the 31-year-old, noting that Cortez could serve as a viable replacement for Walker in the short term.
Cortez’s recent history has been mixed. In 2026, he struggled across eight starts with the Milwaukee Brewers and San Diego Padres, posting a 6.29 ERA, which likely contributed to his free-agent status. However, he has shown the ability to perform at a high level in the past. In 2024, while with the New York Yankees, Cortez made 30 starts and posted a 3.77 ERA, compiling a 9-10 record and generating 2.4 bWAR. That performance demonstrated his capability as a durable, left-handed starter in a major-league rotation.
For Philadelphia, Cortez could address several immediate concerns. Beyond serving as a potential Walker replacement, he would provide another left-handed option in a rotation that otherwise consists mostly of right-handers. Currently, the Phillies’ lefty starters are limited to Cristopher Sanchez and Jesus Luzardo, while Walker, Wheeler, Nola, and Painter are all right-handers. Adding Cortez could provide greater balance and flexibility, particularly if Wheeler’s return from injury is delayed or if the Phillies face matchups where a lefty-heavy rotation is advantageous.
While Cortez isn’t a guaranteed upgrade over Walker, he offers a potentially more reliable alternative in a fifth- or sixth-starter role. The Phillies would be able to evaluate him over the remainder of the season without making a long-term commitment, giving the team depth while minimizing risk. If Cortez recaptures his 2024 form, he could stabilize the back of the rotation and provide Philadelphia with more confidence in its ability to compete deep into the season.
Rymer notes that while Cortez’s ideal landing spot might be the Padres, the Phillies represent a logical fit for both the team and the pitcher. Philadelphia gets a left-handed starter with MLB experience, while Cortez has a chance to showcase his abilities on a contending club. The move would address a short-term rotation need without compromising payroll flexibility, which is always a consideration in-season.
Ultimately, the potential addition of Cortez reflects the Phillies’ proactive approach to roster management. With a mix of veteran arms, young talent, and a need for stability in the back of the rotation, Philadelphia appears willing to explore all options to maintain its competitive edge. Whether Cortez emerges as the solution to Walker’s struggles or simply provides depth, his presence could prove crucial as the Phillies push toward the postseason.
