The running back position is facing significant challenges in fantasy football due to injuries to key players like David Montgomery and Alvin Kamara. As teams look for replacements, Tennessee Titans' Tyjae Spears and Jacksonville Jaguars' Tank Bigsby emerge as potential waiver wire pickups.

Spears has shown promise, particularly as a pass-catcher, and could see increased opportunities if Tony Pollard's ankle issue sidelines him. In contrast, Bigsby struggles for playing time behind Travis Etienne Jr., limiting his fantasy appeal.

Given Spears' higher upside and potential for significant contributions, he is the recommended target for fantasy managers looking to bolster their rosters.