As the MLB season approaches its final stretch, savvy fantasy baseball managers should be proactive on the waiver wire to bolster their rosters. Week 20 brings several undervalued hitters who could provide crucial production. Noteworthy options include Daniel Schneemann of the Cleveland Guardians, who has shown improved performance with a .341 batting average post-All-Star break and a penchant for scoring runs. Also worth considering is Lenyn Sosa from the Chicago White Sox, hitting an impressive .378 in his last 13 games. Joey Loperfido of the Toronto Blue Jays has made an immediate impact since his promotion, with a .404 average and solid power metrics. Spencer Horwitz of the Pittsburgh Pirates has turned things around recently, boasting a .404 batting average over 13 games, while Blake Perkins of the Milwaukee Brewers brings speed and power, showcasing his potential with improving stats.