The San Francisco Giants navigated a revolving door at second base throughout the 2025 season, with Tyler Fitzgerald technically serving as the primary starter—but not without competition. Fitzgerald appeared in 69 games at the position, leading the team, but Christian Koss (47 games), Casey Schmitt (53 games), and Brett Wisely (16 games) all saw significant time, signaling that the Giants’ long-term plan at second base remains unsettled.

Statistically, the quartet struggled to provide consistent production:

• Fitzgerald: .217/.278/.327, 4 HR, 14 RBI

• Koss: .264/.309/.368, 3 HR, 23 RBI

• Schmitt: .237/.305/.401, 12 HR, 40 RBI

• Wisely: .208/.269/.354, 1 HR, 10 RBI

Combined, they contributed just 20 home runs and 87 RBI—numbers far from ideal for a position that could serve as a steady contributor. Wisely, now with Atlanta after a midseason release, is no longer part of the mix, leaving Fitzgerald, Schmitt, and Koss under team control heading into 2026. The Giants must decide whether to keep all three or explore trades or non-tender options to streamline the roster.

Fitzgerald brings versatility, capable of starting at second while backing up multiple positions. He also offers a bounce-back potential, having slashed .280 with 15 home runs and 34 RBI in 2024. Schmitt provides flexibility across three infield spots and showed career-high power with 12 homers in 2025, even if his .237 batting average was only average. Koss, a 12th-round pick of the Colorado Rockies in 2019, impressed with his .983 fielding percentage and showed flashes of offensive promise in limited Major League action.

Looking forward, Diego Velasquez, the organization’s top second base prospect who finished 2024 at Double-A, could shake up the competition if promoted in 2026. Until then, the Giants are expected to rely on Fitzgerald, Schmitt, and Koss battling it out for the starting role in spring training, hoping one emerges as a reliable presence at a key infield position.