NFL world reacts to Borland's retirement, some with surprising words (VIDEO)
MAR 17, 4:37a ET | FOX Sports
Rotowire: Jan 3 / 11:48a ET
News: Brock played in just three games this season, recording seven tackles (all solo) over that span.
Impact: Brock had an injury riddled season, dealing with toe and hamstring injuries. He was expected to be a starter coming into training camp, but health issues cost him nearly the entire season. He is still under contract for 2015, and will likely be given another shot to start in a shallow 49ers' secondary.