The Arizona Diamondbacks have made some strategic adjustments to their bullpen ahead of today’s game, introducing right-hander Dennis Santana from Triple-A Reno. In a corresponding roster move, left-hander Philip Abner has been designated for assignment.
A Closer Look at Dennis Santana
Santana, who signed a minor league deal with Arizona on August 6, had a challenging season with the Pittsburgh Pirates prior to joining the Diamondbacks. He posted a disappointing 6.05 ERA over 41 2/3 innings, raising questions about his effectiveness on the mound. Even though his 4.61 SIERA hints at some bad luck influencing his performance, statistics like this don’t do much to instill confidence among fans or coaches. Notably, Santana, who previously thrived on generating ground balls, has seen his ground ball rate plummet to 29.6% this year, significantly below the league average of 41.6%. With pitchers typically relying on such metrics to maintain control and reduce hits, this decline is alarming. Furthermore, he has surrendered eight home runs this season, compared to just five over nearly 30 more innings in 2025. This pattern suggests an inability to keep the ball in the park, potentially creating pressure situations for a team that’s striving to make a playoff push.
Past Performance and Potential
It’s essential to highlight that Santana was once a reliable contributor for Pittsburgh between 2024 and 2025. He demonstrated his potential after being claimed off waivers in June 2024, posting an impressive 2.44 ERA in 44 1/3 innings along with a notable K-BB rate of 22.7%—well above average. That kind of control and effectiveness means he’s shown he can compete at a higher level. He followed this with an even stronger 2.18 ERA in 2025, showing exceptional command with merely a 6.3% walk rate. This inconsistency raises eyebrows—what happened to the pitcher who seemed to find his groove? Could his issues this season be attributed to changes in pitching mechanics or perhaps external factors like injuries? Understanding this could be vital for the Diamondbacks as they attempt to turn his performance around.
The Diamondbacks' Bullpen Dynamics
Given his recent drop-off in performance, the Diamondbacks likely don't expect Santana to replicate past success immediately, especially as they pursue a postseason spot with a current record of 66-58. While they are taking a calculated risk bringing him up, it also speaks to their available options. His stay on the roster could be short-lived, as fellow right-handed options like Gerardo Carrillo, Taylor Clarke, and Juan Morillo are all performing notably well since the All-Star break, each with ERAs below 1.00. With these pitchers showing effectiveness, the pressure will be on Santana to prove himself quickly. If he underperforms, it wouldn’t be shocking to see him return to Triple-A.
The Situation for Philip Abner
On the flip side, Philip Abner’s designation for assignment marks a challenging turn in his career. The 24-year-old, who was Arizona's sixth-round draft pick in 2023, has had a rocky season with a 6.28 ERA over 14 1/3 innings in the majors, coupled with a troubling walk rate exceeding his strikeouts. That’s a reality few pitchers can overcome in the big leagues. After a particularly rough outing against the Nationals in June, he struggled further with a 6.91 xERA in 10 2/3 innings following that game, showing clear ineffectiveness down the stretch. His struggles continued in Triple-A Reno, where he recorded a 5.01 ERA this season. The trajectory is concerning, as a quick turnaround isn’t standard for pitchers dealing with such issues.
If Abner clears waivers, he will have the opportunity to accept an outright assignment to Reno. This could serve as a reset button of sorts. (and this is the part most people overlook) Finding his footing at the minor league level can often lead to a more fruitful comeback. However, the harsh reality is that repeated struggles can hamper a player’s confidence—any chance of reestablishing himself will rely not just on his skill but also on mental resilience. He may eventually find his way back to the big leagues if he can regain his form.
Future Implications
The moves by the Diamondbacks reflect a broader strategy as they aim for playoff contention. If Santana can adapt swiftly, he may become a key asset in a tight race. Conversely, if he falters, it won't just affect his career but could impact the team's momentum. The organization faces an uphill battle, navigating the pressure that accompanies significant roster moves during critical moments of the season. As for Abner, whether he can reclaim his promise is a story to watch closely. Look, this isn't just about numbers; it’s about identity. If you're working in this space, understanding player psychology could be as essential as understanding their analytics. The stakes are high, and the future for both players is uncertain.
Photo courtesy of Charles LeClaire, Imagn Images