Giants infielder Casey Schmitt leaves Brewers game with leg injury, a significant loss.

San Francisco Giants third baseman Casey Schmitt left Monday night's game against the Milwaukee Brewers in the second inning with an apparent left leg injury. Schmitt appeared to hurt himself after rounding first base, and was replaced immediately by backup Christian Koss, according to MLB.
The timing is brutal for San Francisco. Schmitt has been one of the Giants' best hitters in 2026, batting a career-high .271 with a .784 OPS and 21 home runs in just 98 games. The team is already thin at third base, with starter Matt Chapman sidelined on the 10-day injured list with an abdominal strain.
Schmitt appeared to injure his left leg while rounding first base in the bottom of the second inning, according to SFGate. He slowed noticeably after making the turn and did not attempt to advance. Team trainers came onto the field, and Schmitt was pulled from the game shortly after.
The exact nature of the injury was not immediately clear, Bakersfield.com reported. No official diagnosis or timetable was announced during the game. Schmitt walked off the field under his own power, which may be an encouraging sign.
Backup infielder Christian Koss replaced Schmitt at third base after the injury, according to HJNews. Koss is a reserve option who has seen limited action this season. His role could expand significantly if Schmitt's injury requires time on the injured list.
The Giants already moved Chapman to the 10-day IL with an abdominal strain before this series. Losing Schmitt would leave San Francisco extremely short-handed at the hot corner. Koss would likely become the everyday starter at third base until one of them returns.
Schmitt has been one of the Giants' most productive players in 2026. He is hitting .271, a career high, with a .784 OPS. His 21 home runs rank second on the club through 98 games, according to MLB.
Those numbers represent a clear step forward for the 25-year-old. Losing him for any stretch of time would hurt San Francisco's offensive production and lineup depth. The Giants have not yet commented on the severity of the injury or a potential return date, Winnipeg Free Press noted.
With both Chapman and now Schmitt potentially unavailable, the Giants are facing a serious depth problem at third base. Chapman went on the 10-day IL before the series opener, leaving Schmitt as the primary option. Now that option is also in question, The Facts reported.
San Francisco will need to decide quickly whether to place Schmitt on the injured list and call up additional help. The Giants have not made a roster move public as of game time. All eyes will be on the team's next move as they try to stay competitive with a thinned-out infield.
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