As Week 12 of the 2025 fantasy baseball season unfolds, key players are rising or falling in performance, impacting their value in fantasy leagues. Evan Carter of the Texas Rangers has shown promise with a .283 batting average, powered by speed and newfound power since his call-up. In contrast, Corey Seager is struggling, battling performance issues and injuries, presenting a potential buy-low opportunity for fantasy managers.

Jeff McNeil from the New York Mets is trending upward with a solid .268 average and improved power metrics, while hitters like Brice Turang, who initially excelled, are now underperforming in stolen bases. On the pitching side, Shelby Miller has stepped up as a closer for the Arizona Diamondbacks, while David Peterson of the New York Mets is having a breakout season. However, Bailey Ober's inconsistencies raise concerns for fantasy owners.