SANTA CLARA — Three practices at 49ers training camp have offered a mere appetizer of what’s to come, from the stars to the scrubs. Here is a premature evaluation of an under-the-radar player (or not an entrenched starter) at each position that’s sparking intrigue:

One of the standouts of the opening day of camp: receiver Jauan Jennings, who isn't waging the sort of "hold in" Brandon Aiyuk did last year

San Francisco 49ers undrafted rookie WR Isaiah Neyor is already raising eyebrows in his first NFL training camp.

Former Tennessee Vols wide receiver Jauan Jennings went viral on Wednesday for the way he handled the first day of training camp with the San Francisco 49ers amid his recent contract demands . ESPN reported earlier this month that Jennings wants the 49ers to either give him a new contract or trade him.