Hayward Field set to host Nike Prefontaine Classic & Nike Track Nationals Friday & Saturday...

Saturday's Nike Prefontaine Classic promises to be one of the most explosive invitational meets on American soil in a long time, featuring no less than 41 Olympic or World Championship medalists competing in a three-hour window starting at noon at Historic Hayward Field.SPRINTS:American 100m record holder and 2009 World Outdoor Championships silver medalist Tyson Gay has been battling a sore