Whether you're in need of an injury fill-in or just a hot-hand play, Scott White has you covered with 10 sleeper hitters for the upcoming scoring period, all rostered in less than 80 percent of CBS Sports leagues. They're not must-starts by any estimation, but they're the best you'll find off the waiver wire.

All information is up to date as of late Sunday.

Best hitter matchups for Week 21

1. Rockies @STL3, ARI4
2. Diamondbacks @TEX3, @COL4
3. Tigers @CHW3, @MIN4
4. Royals WAS3, CHW3
5. Phillies @CIN3, @WAS4

Worst hitter matchups for Week 21

1. Padres @SF3, @LAD3
2. Reds PHI3, MIL3
3. Orioles SEA3, @HOU3
4. Marlins @CLE3, @BOS3
5. Blue Jays CHC3, TEX3