Arizona Diamondbacks face key player improvements for 2027

Following a 2026 season where the Arizona Diamondbacks finished with an 86-76 record but missed the playoffs, the team faces several key personnel challenges and opportunities heading into 2027.

Key players identified for improvement include pitcher Merrill Kelly, who struggled with consistency and posted a career-worst 4.94 ERA, and second baseman Ketel Marte, whose offensive production saw a decline compared to previous years. Shortstop Geraldo Perdomo also faces scrutiny regarding his performance in high-pressure situations despite a solid WAR of 5.0.

On the defensive side, the Diamondbacks' bullpen emerged as a strength in 2026. Analysts suggest the team should prioritize retaining relief pitchers like Taylor Clarke, who transitioned effectively from a starter to a reliable reliever with a 2.96 ERA, and Jonathan Loáisiga to maintain the unit's stability.