Week 21 of 2025 brings a prime chance to hunt for 40%-rostered hitters with favorable schedules and park factors. Nine teams are set for seven games, with nine others at six, while Rays play five. LAD and LAA emerge as ballpark upgrades, boosting power and volume for hitters in those parks. Top streamer targets include Blaze Alexander, Miguel Andujar, Noelvi Marte, Ryan Mountcastle, Luis Rengifo, Jake Cronenworth, Joey Ortiz and Daulton Varsho, each riding recent hot streaks and strong lineup spots. Deeper options like Gavin Lux, Tyler Freeman and Evan Carter offer upside in deeper leagues. The guide stacks raw volume, park-driven upside, and post-deadline roster moves to fill Week 21 gaps and chase early-week exploration of the waiver wire.