Mariners Add Josh Simpson as Southpaw Groundballer Depth, Hope Homer Stays Behind

For all their strengths, the 2025 Seattle Mariners had little in the way of lefties on the mound. There was Gabe Speier … and that was about it for the top line, given that a deadline trade for Caleb Ferguson did little but wash out. Though Speier did well early on in the ALDS, the Tigers (and later, Blue Jays) got to see him time and time again, allowing them to adjust to his style on the mound.

The M’s have already addressed this issue at the top level, bringing in Jose A. Ferrer from the Washington Nationals, but more depth is never a bad thing. Robinson Ortiz, another winter acquisition, has zero MLB experience despite some clear potential upside. Mariners brass, therefore, brought in southpaw Josh Simpson from the Marlins in exchange for cash considerations.

Simpson is clearly a reclamation project for the Mariners, coming off a 7.34 ERA, 5.35 FIP, and 1.826 WHIP in 31 appearances in his rookie season last year. His fastballs are below average, but he does have good movement on his sweeper and curveball, with his curve mostly being used against righties and the sweeper against lefties. Control was a big issue for Simpson in 2025, with a 14.6% walk rate and 92 Location+ according to FanGraphs (where 100 is league average), but the real killer was the home run ball.