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Mason was included on the 49ers' initial 53-man roster Tuesday, Matt Maiocco of NBC Sports Bay Area reports.
Barring any changes to the roster heading into the Sept. 11 season opener at Chicago, Mason will be one of five running backs for the 49ers. The undrafted rookie out of Georgia Tech earned his spot by leading the 49ers in rushing this preseason, averaging 4.9 yards per carry while totaling 94 yards on the ground. He won't get much run early in the season due to the depth San Francisco carries at the position. That said, Elijah Mitchell (knee) -- who is expected to be ready by Week 1 -- comes into the season banged up, and there's no guarantee that either Trey Sermon or Tyrion Davis-Price will hold their spots above Mason on the depth chart.
