What happened: Black flashed a physical running style on multiple carries during San Francisco's first training-camp practice. The rookie is competing for work behind McCaffrey in an open backup race.

Why it matters: San Francisco is evaluating options to reduce the burden on its lead back during the upcoming season. Black can turn a third-round investment into an immediate role with a strong camp.

What to watch: Watch how the 49ers divide backfield reps as training camp advances.