As Week 20 of the MLB season approaches (August 11-17), fantasy baseball players are gearing up for key waiver wire pickups. This week highlights players to target who are under 40% rostered in Yahoo! leagues, focusing on emerging power hitters and multi-positional infielders that could significantly bolster your roster. Recommended spending for FAAB (Free Agent Acquisition Budget) is crucial, as careful allocation can lead to significant gains in various categories. Players like Ryan Jeffers of the Minnesota Twins are among those to consider, potentially providing essential offensive support during the stretch run of the season.