In this April 17, 2008 file photo, University of Southern California freshman basketball player O.J. Mayo, who announced on April 9 that he was declaring for the 2008 NBA Draft, smiles during a news conference at the USC Galen Center in Los Angeles. A former friend of Mayo has alleged that Mayo violated NCAA rules by accepting tens of thousands of dollars in cash and benefits from an L.A. events promoter.
LOS ANGELES The sports agency representing O.J. Mayo denied any illegal activity involving the Southern California star on Monday, a day after ESPN reported Bill Duffy Associates gave cash to an event promoter who provided gifts.

