As we enter Week 12 of the fantasy baseball season, astute managers have a chance to capitalize on undervalued assets. This week, five hitters shine: Willi Castro, Josh Smith, Miguel Vargas, Ryan McMahon, and Sal Frelick. Each of these players has shown potential for significant impact, making them worthy additions to your roster.

Willi Castro of the Minnesota Twins has returned from injury with impressive stats, batting .370 over his last seven games. Josh Smith's versatility and recent performance for the Texas Rangers have made him a key contributor. Meanwhile, Miguel Vargas of the Chicago White Sox is establishing himself as a reliable hitter, while Ryan McMahon is leveraging Coors Field's advantages. Finally, Sal Frelick continues to impress with his solid batting average and base-stealing skills for the Milwaukee Brewers. These players present various opportunities for fantasy managers looking to enhance their lineups as the summer months approach.