Menelik Watson

Watson's first practice of training camp lasted less than 30 minutes Thursday before the Oakland Raiders' offensive lineman left the field after re-injuring a calf muscle in his left leg.

Posted: Aug. 7, 2013 8:07 PM ET

Watson, the 42nd overall pick and projected backup to right tackle Khalif Barnes, had been on the non-football injury list since the beginning of camp after injuring his calf in mid-July.