Widespread interest in Walker is only logical. He's been among the most underrated players in the sport for several seasons. The 33-year-old slugger's .251/.335/.468 slash from 2024 is a near mirror image of the broader .253/.332/.464 line he carries in nearly 3200 plate appearances dating back to 2019. At the time, it would've seemed utterly nonsensical to think that the Diamondbacks would be able to successfully replace perennial All-Star Paul Goldschmidt with a journeyman waiver claim, but Arizona did just that and has been rewarded handsomely.
Not only has Walker been consistently productive at the plate -- 13% better than average overall, including 20% better over the past three seasons -- he's emerged as one of the game's best defenders at his position. Walker has won three straight Gold Gloves for his work at first base. Walker's 33 Defensive Runs Saved over the past three seasons lead all big league first baseman by a wide margin. Matt Olson is second, at 27. Statcast is even more bullish, crediting Walker with 39 Outs Above Average -- nearly double that of second-ranked Carlos Santana (20). He's made only eight errors since 2022.
Quietly excellent as Walker has been, however, a four-year deal is a lofty ask when considering his age. He'll turn 34 in March. As shown in MLBTR's Contract Tracker, only four position players in the past decade have secured a four-year deal beginning in their age-34 season or later: Josh Donaldson (four years, $92MM with the Twins), Ben Zobrist (four years, $56MM with the Cubs), Nelson Cruz (four years, $57MM with the Mariners) and Victor Martinez (four years, $68MM with the Tigers. Donaldson's deal, now almost five years old, is the most recent of the bunch. Of the four, only Cruz's contract played out well.
Suffice it to say, four years would break any recent precedent for a position player of this age. Speculatively speaking, he could go the route some other veterans have in the past to secure the additional years they seek on longer-term deals: throw in (in this instance) the fourth year at a discounted rate. General expectations for Walker have been that he'll command something in the vicinity of $20MM per year. If he were to tack on a fourth year at, say, $8-10MM, that'd get him his fourth season and also lower the luxury-tax hit for the signing club. For many of Walker's reported suitors, that won't be a factor, as they're not CBT payors anyhow. For a team like the Yankees or Astros, it could prove significant.
Walker's asking price is likely one of the reasons that the Yankees "appear increasingly likely to go with a more inexpensive option at first base," as reported by Ken Rosenthal of The Athletic. The others include the qualifying offer that'd cost them an additional two draft picks (after already punting two for Max Fried) and the plethora of options available on the free agent market (Santana, Justin Turner, Goldschmidt) and trade market (Josh Naylor, Yandy Diaz, Nathaniel Lowe).