Rock Ya-Sin

49ers signed CB Rock Ya-Sin, formerly of the Ravens, to a once-year contract.

Ya-Sin spent last season with the Ravens and wound up appearing in 14 games while making one start. He totaled 13 tackles and two pass breakups on the year while earning a PFF coverage grade of 63.8. However, he played on a career-low 279 defensive snaps—significantly less than his previous low of 592. Ya-Sin will provide nice depth to the 49ers’ secondary but is unlikely to draw many starts.