PHOENIX — The Arizona Diamondbacks have agreed to trade first baseman Josh Naylor to the Seattle Mariners, per The Athletic’s Ken Rosenthal.
The Diamondbacks acquired pitchers Brandyn Garcia and Ashton Izzi from the Mariners in exchange for Naylor, per ESPN’s Jeff Passan. Arizona Sports’ John Gambadoro reported Garcia will join the Diamondbacks while Izzi will go to the High-A affiliate Hillsboro Hops.
Garcia is listed as the Mariners’ No. 13 prospect, while Izzi is listed as the team’s No. 16 prospect, per MLB pipeline.
Garcia was picked in the 11th round by the Mariners in the 2023 MLB Draft. In 32 appearances with the Triple-A Tacoma Rainiers, he has pitched 33.1 innings with a 3.51 ERA, 42 strikeouts and five saves.
Garcia made his MLB debut on Monday and last pitched on Wednesday.
Brandyn Garcia is a 25yo LHP picked in the 11th round in 2023. He has 2 MLB appearances
In the minors this year, he’s made 32 appearances in relief with a 3.51 ERA, 42 Ks, 17 BB and 5 saves
Unorthodox arm angle, Seattle’s 13th prospect on MLB Pipeline
— Alex Weiner (@alexjweiner) July 25, 2025
Izzi was selected in the fourth round of the draft in 2022. He has 12 starts with the High-A Everett AquaSox, posting a 5.51 ERA with a 2-4 record and 54 strikeouts.
Ashton Izzi, 21, was a 4th rounder in 2022 out of high school.
He’s made 12 starts in High-A this year with a 5.51 ERA, 54 Ks and 21 BB.
He was Seattle’s 16th prospect via MLB Pipeline.
— Alex Weiner (@alexjweiner) July 25, 2025
The Diamondbacks traded for Naylor during the offseason, bringing him in after losing longtime franchise first baseman Christian Walker to the Houston Astros in free agency. Arizona sent the Cleveland Guardians pitcher Slade Cecconi and a competitive balance round B pick for Naylor, a 2024 American League All-Star.
Naylor has continued to hit this year after joining the Diamondbacks, starting out hot by hitting .341 in his first 23 games. He homered in three straight games at the Miami Marlins during that stretch.
He hit .292 as a Diamondback, slashing .292/.360/.447 with 11 home runs. He also set a career high in stolen bases before the end of July with 11. He became the third D-backs first baseman with double-digit home runs and steals, joining Paul Goldschmidt (five times) and Walker.
Naylor’s defense has been a bit more hit-and-miss with -3 outs above average, which is quite the difference from Walker’s three Gold Glove seasons.
Naylor will hit free agency for the first time at the end of the season as a 28-year-old.
The Diamondbacks brought in Naylor on an expiring contract as a win-now move after losing Walker with the rest of the roster in position to compete. After Naylor and ace pitcher Corbin Burnes joined the clubhouse, internal and external expectations for the Diamondbacks rose, as they were a projected postseason team.
This season has not gone to plan due to injuries and inconsistent play, mostly from a pitching and defense perspective. The Diamondbacks have struggled to stay above .500, and as they trail a competitive race for the third NL Wild Card spot, the front office has elected to pivot.
