CULVER CITY -- The window of opportunity has opened for Oregon sophomore Byron Marshall.
The former Valley Christian High-San Jose star is competing to become the Ducks' starting tailback, one of the most high-profile positions in the Pac-12.
Marshall spent last season as the backup to senior Kenjon Barner and averaged just eight carries per game.
His primary competition this fall is expected to come from incoming freshman Thomas Tyner, a first-team parade All-American.
Oregon star De'Anthony Thomas lines up in the backfield on occasion but will likely spend most of his time at receiver.
"We have a lot of carries to account for,'' Ducks coach Mark Helfrich said Friday at Pac-12 football media day. "Byron has unlimited potential -- all the skills necessary to be a great back.''
Helfrich said Marshall has thus far shown the tendency to "feel his way."
"That's OK,'' he added. "He's a guy that, maybe over the summer, it clicks."