Denver Broncos at Oakland Raiders

As former Tennessee women's basketball coach Pat Summitt and her son, Tyler, watch, Denver Broncos quarterback Peyton Manning presents a $500,000 donation to the Pat Summitt Foundation on Thursday, April 11, 2013, in Knoxville, Tenn. The donation, made by Manning and his wife, Ashley, is the largest gift so far to the foundation. The foundation was established in November 2011 to help fight Alzheimer's disease. Manning, who played at Tennessee from 1994-97, is an honorary co-chair of the foundation's advisory board. (AP Photo/Knoxville News Sentinel, Amy Smotherman Burgess)