Diamondbacks lock in hitting coach Joe Mather for 2027, keeping Torey Lovullo’s staff intact for now

Arizona moved to quiet offseason questions about its baseball operations leadership by retaining hitting coach Joe Mather, indicating that manager Torey Lovullo’s coaching staff will look familiar into 2027. Multiple reports tied the decision to the club’s broader push to keep its offensive instruction steady after the season ended.

According to Arizona Sports reporter John Gambadoro, the Diamondbacks put the unresolved part of the hiring picture to bed when they gave Lovullo a two-year deal on October 1. That agreement, reported through coverage by Alex Weiner of Arizona Sports, was seen as the clearest indication that the team intends to maintain continuity with the manager at the center of its day-to-day approach.

With Lovullo returning, attention quickly turned to the rest of his staff. The Diamondbacks are expected to bring Mather back for what would be his sixth season as hitting coach, keeping the organization’s approach to batting instruction consistent from one year to the next. For a team that plays a high-volume schedule of development and adjustment each spring, continuity in the hitting department matters because the impact of coaching changes is not immediate. It typically shows up through approach, swing decisions, and how hitters handle the same scouting looks from one season to the next.

The Diamondbacks did not keep every member of the staff the same, however. The organization parted ways with pitching coach Brian Kaplan five days after Lovullo’s contract was announced, according to the same reporting chain. That timing suggests a deliberate separation of priorities: lock in the manager first, then reshape specific areas of the coaching staff once the broader leadership question was resolved.

Joe Mather’s return keeps one half of the staff blueprint intact, while the pitching side enters a new era. For baseball clubs, a staff change like that can ripple beyond the bullpen and starting rotation, affecting how pitchers train for fielding, how they sequence pitches, and how they communicate in-game adjustments. Even if those responsibilities are formally assigned to the pitching coach, they depend on how the entire staff coordinates with the manager and the hitting coach in practice planning.

There is also a practical roster-development element to this decision. Hitting coaches often work closely with player development coordinators and position coaches on setting swing principles for different player types, from contact-first hitters to more swing-and-miss profiles. Keeping Mather on staff reduces the odds of a full philosophy reset in 2027 and can help players who are midstream in their development avoid having to re-learn the same core ideas under a new voice.

Still, the situation remains incomplete in the public record because no official team announcement was cited in the coverage summarized here. The reported coaching move is therefore best treated as the club’s current plan rather than a confirmed end-to-end offseason timeline. What to watch next is whether the Diamondbacks fill out the remainder of Lovullo’s staff with the new pitching-coach hire, and how quickly the organization’s instructional messaging coalesces heading into the spring.

For Arizona, the retention of Mather is a statement about what the organization wants to preserve: an established structure for batting approach and in-game hitting decision-making under the same coach. The more consequential question now is whether the pitching staff transition, paired with offensive stability, produces the kind of improvement that can move the Diamondbacks back toward contention over a full season. That answer will arrive when the organization reveals its full coaching roster and begins the next round of player development for 2027.