Seattle, March 2025 – Over the past few seasons, the Seattle Mariners have built one of the most promising starting rotations in baseball Jhonathan Diaz Shirt. Now, in 2025, it might finally be one of the best in the American League. At the top of the rotation is Luis Castillo, who finished 2024 with a 3.25 ERA and 200 strikeouts. Castillo, a dominant right-hander, is looking to make a push for his first Cy Young Award this season Nicholas Raposo Shirt. Behind him, George Kirby and Logan Gilbert continue to develop into reliable frontline starters. Kirby, who posted a 3.40 ERA with an impressive 5.8 K/BB ratio, has elite command, while Gilbert’s high-velocity fastball makes him a tough matchup. The Mariners also have Bryce Miller and Bryan Woo, two young arms with elite potential, rounding out the rotation. "I think our pitching is as good as anyone’s," Castillo said. "If we stay healthy and execute, we can compete with any team in baseball." With a top-tier rotation, the Mariners will be tough to beat in the AL West.