The St. Louis Cardinals traded Nolan Arenado to the Arizona Diamondbacks for Jack Martinez and a draft pick on January 13, 2026.

The St. Louis Cardinals traded veteran third baseman Nolan Arenado to the Arizona Diamondbacks on January 13, 2026, in exchange for 22-year-old right-hander Jack Martinez, a draft pick from Arizona State, and cash. Arenado, 34, waived his no-trade clause and is under contract through 2027. His 2025 season saw a steep decline in production, with career lows in batting average, on-base percentage, slugging percentage, and OPS, hampered by a shoulder injury. The Cardinals are rebuilding, while Arizona aims to strengthen its infield with Arenado’s defensive prowess and leadership.