In the bottom of the fifth inning in the August 29 game against the Los Angeles Angels, Oakland Athletics center fielder Coco Crisp sustained a neck strain leaping at the wall in left center field. Crisp initially had caught the ball, but the impact knocked the ball out of his glove, resulting in a two-run home run for Angels catcher Chris Iannetta (link to video at mlb.com). Crisp walked off the field under his own power, and was replaced by Craig Gentry.
Susan Slusser of the San Francisco Chronicle notes that A's manager Bob Melvin is not yet sure of the severity of Crisp's injury:
Melvin not sure of severity of Crisp's injury but same one he has had before this year. Initial fear was head injury but no concussion.— Susan Slusser (@susanslusser) August 30, 2014
With rosters expanding soon, it is unlikely the Athletics will elect to place Crisp on the disabled list, and will wait to see if his condition improves.