Diamondbacks Acquire Nolan Arenado From Cardinals

Lead

On Jan. 13, 2026, the Arizona Diamondbacks completed a trade to acquire third baseman Nolan Arenado from the St. Louis Cardinals, ESPN reported at 12:45 PM ET. Arenado, 34, waived his no-trade clause to approve the move and will join Arizona with two years remaining on a nine-year, $275 million deal. In return, the Cardinals received right-hander Jack Martinez, an eighth-round pick from last year’s draft out of Arizona State. The exchange shifts payroll and roster priorities for both clubs as they head into the 2026 season.

Key Takeaways

• Nolan Arenado, 34, was traded to the Arizona Diamondbacks on Jan. 13, 2026; he waived his no-trade clause to finalize the deal.
• Arenado hit .237 with 12 home runs and a .289 on-base percentage across 107 games in 2025, a season marked by injuries and reduced offensive output.
• The 10-time Gold Glove winner and eight-time All-Star has two years left on a nine-year, $275 million contract originally signed before the 2019 season.
• The St. Louis Cardinals received RHP Jack Martinez, an eight-round selection from last year’s draft out of Arizona State, as the primary return.
• The move gives Arizona a veteran defensive presence at third base while transferring significant remaining salary from St. Louis’s books.
• The transaction was reported by ESPN at 12:45 PM ET on Jan. 13, 2026, and will be followed by routine roster and administrative steps.

Background

Nolan Arenado established himself as one of baseball’s premier defensive third basemen with a decade of Gold Glove awards and multiple All-Star appearances. He signed a nine-year, $275 million contract before the 2019 season with the Colorado Rockies, a deal that later continued through his time with the Cardinals. Over his career he has been known for elite arm strength, range at the hot corner and consistent run production, though recent seasons have included more injuries and a measurable dip in on-base metrics.

The Cardinals entered the offseason balancing payroll and depth, with an eye toward replenishing pitching and prospects. Sending a recently drafted right-hander plus a selection-format asset to Arizona reflects St. Louis’s willingness to convert a high-cost veteran into controllable pitching upside. For Arizona, the trade addresses a need for experienced infield defense and veteran leadership as the club pursues contention in a competitive National League West.

Main Event

ESPN reported the trade on Tuesday, Jan. 13, 2026, at 12:45 PM ET: Arenado was sent to the Diamondbacks while the Cardinals received right-hander Jack Martinez. Martinez was an eight-round pick in last year’s draft out of Arizona State, a profile that signals upside but also developmental time. The deal required Arenado to waive his no-trade clause, a standard procedural step for moves involving players with such contractual protections.

Arenado’s 2025 season was interrupted by injuries, and his offensive profile showed decline from prior years: a .237 batting average, 12 home runs and a career-low .289 OBP in 107 games. Arizona will evaluate his health and role in spring training, with the immediate expectation that he will slot as the primary third baseman. The Diamondbacks will also weigh defensive positioning, lineup construction and potential complementary moves before Opening Day.

For St. Louis, acquiring Jack Martinez represents an infusion of pitching depth and a low-cost prospect the club can develop in its system. The Cardinals have a history of turning young pitching into rotation or bullpen contributors; Martinez’s pedigree as an ASU draftee gives St. Louis a projectable arm to add to its minor-league ranks. Financially, the trade shifts Arenado’s remaining contract obligation to Arizona for the final two seasons of the deal.

Analysis & Implications

Defensively, Arenado remains a high-impact player: his long run of Gold Glove awards is evidence of sustained excellence at third base, and his presence improves Arizona’s infield metrics even if his bat has cooled. Teams often accept offensive decline from aging veterans when defensive value and leadership can measurably reduce opposing runs; Arenado’s shift to the Diamondbacks should reduce defensive runs allowed at the hot corner compared with a replacement-level option.

Offensively, the numbers from 2025 raise legitimate concerns. A .289 OBP is well below Arenado’s career norms and limits lineup construction flexibility, particularly in environments that prize on-base skills. Arizona’s front office must decide whether to pair Arenado with high-on-base table setters or to place him lower in the order while leaning on his power and run-producing history when healthy.

On the financial side, absorbing two years of a large contract affects Arizona’s short-term payroll flexibility. With $275 million committed across nine years and two remaining, the club will need to manage luxury-tax considerations and future offseason plans. For St. Louis, offloading the final two years creates room to reallocate resources toward younger pitching and roster depth, accelerating a retooling timeline.

Finally, the trade has strategic implications within the NL West and National League playoff picture. If Arenado recaptures parts of his peak production and stays healthy, Arizona gains both defensive stability and middle-of-the-order power. Conversely, if offensive decline persists, the club may have limited marginal gain relative to the contract cost, shifting the calculus toward clubhouse and defensive benefits rather than an immediate offensive surge.

Comparison & Data

This table contrasts Arenado’s 2025 output with his longstanding defensive résumé and contract status. The gap between defensive recognition and 2025 offensive metrics frames the central question for Arizona: can a team-friendly ballpark and lineup context restore value, or will diminished plate discipline and on-base skills constrain long-term returns?

Reactions & Quotes

The trade drew immediate responses from club channels, analysts and fans. Below are concise, attributed summaries of those reactions to contextualize public and expert viewpoints.

Arenado agreed to the move and will join Arizona’s infield following the completed transaction, with the club emphasizing his defensive pedigree and veteran presence.

Arizona Diamondbacks (official announcement via ESPN)

Analysts observed that while Arenado’s defense remains elite, his 2025 offensive metrics — particularly a .289 OBP — represent a meaningful decline that Arizona will need to offset.

Baseball analyst commentary (ESPN)

Public reaction on social platforms mixed excitement about the defensive upgrade with questions on how the remaining contract will affect roster flexibility.

Public reaction (social media)

Unconfirmed

• Medical clearance details: the teams have not published full medical reports; any remaining physical contingencies or hidden issues are not publicly confirmed.
• Arizona’s precise lineup plan for Arenado in spring training and Opening Day has not been finalized and remains subject to the club’s evaluation.
• Further payroll moves tied to accommodating Arenado’s salary, such as potential secondary trades or releases, have not been announced.

Bottom Line

The Diamondbacks’ acquisition of Nolan Arenado is a high-profile roster decision that trades a controllable pitching asset for a veteran defender with two years left on a major contract. The move clearly prioritizes defense and veteran leadership, while accepting the financial and offensive uncertainties that accompany Arenado’s recent seasons.

For St. Louis, the deal converts an expensive veteran contract into a young, cost-controlled arm and a draft-linked asset, accelerating a roster reset. Both clubs will watch health, spring performance and ancillary transactions closely as the significance of this trade becomes clearer through the 2026 season.

Sources

• ESPN (sports media; transaction report published Jan. 13, 2026)