After more than a yearlong residency on the rumor mill, Nolan Arenado’s time in St. Louis is over. The Cardinals announced Tuesday that they’ve traded Arenado and cash to the D-backs in exchange for minor league right-hander Jack Martinez (Arizona’s eighth-round pick in the 2025 draft). The Cardinals are including a reported $26MM in cash to help facilitate the trade.
With the Cardinals entering a rebuild under new president of baseball operations Chaim Bloom, trading the 34-year-old Arenado (35 in April) has been a primary goal this offseason. He’s still owed two years and $42MM, though the Rockies are on the hook for $5MM of that sum. Arizona is on the hook for $5MM this season and $6MM next year.
Three years ago, a salary dump of Arenado would’ve been hard to imagine. He was a National League MVP finalist after hitting .293/.358/.533 with 30 home runs and his typical brand of elite defense during that 2022 season. His offense slipped considerably in 2023 (.266/.315/.459) but was still north of league average. It dipped to about average in 2024, however, and plummeted well below par this past season.
In 436 plate appearances with the Cardinals in 2025, Arenado turned in an anemic .237/.289/.377 batting line. By measure of wRC+, he was 16% worse than an average hitter at the plate. Arenado’s 12 home runs were his lowest in a full season since his rookie year back in 2013. This year’s 6.4% walk rate was his lowest since 2015. When considering that his 34.1% chase rate on pitches off the plate was also his worst since 2015, that’s not particularly surprising. Arenado’s 11.2% strikeout rate was one of the lowest in MLB and one of the best in his career, but he also posted his highest-ever infield fly rate — 16.5% of his fly-balls were harmless pop-ups — and recorded some of the worst exit velocity and hard-hit numbers of his career.
Suffice it to say, Arenado’s decline at the plate has been steep. He still possesses plus contact skills but will need to scale back his chase rate and cut out some of those weak pop-ups if he’s to improve in a meaningful way. Fortunately for Arenado, he’s going to a more favorable offensive environment than the one he’s been calling home in St. Louis. While Phoenix’s Chase Field isn’t the hitters’ haven it once was, it plays largely neutral to right-handed power now — a stark gain for Arenado relative to St. Louis’ Busch Stadium, which is the fifth-worst park for right-handed home run power over the past three years, per Statcast’s Park Factors.
Katie Woo of The Athletic first reported that the two sides were in serious discussions. John Gambadoro of 98.7 FM Arizona Sports broke the news that an agreement was in place and added that Martinez was going back to St. Louis. Nick Piecoro of the Arizona Republic first reported details on the cash changing hands.
More to come.
