MEMPHIS, Tenn. -- Memphis Grizzlies guard O.J. Mayo believes an "energy drink" he bought at a gas station contained the substance that led to his 10-game suspension. Mayo spoke about his suspension for the first time Saturday before the Grizzlies' game against the Washington Wizards, saying he didn't know the drink "had any bad substances in it." The NBA suspended Mayo on Thursday for testing positive for dehydroepiandrosterone (DHEA), which is on the league's list of banned performance-enhancing drugs. The shooting guard said it wasn't as if he "ordered some supplement off the Internet." His suspension started Friday night at Philadelphia and he will be eligible to return Feb. 15, also against the 76ers in Memphis.