MEMPHIS, Tenn. — Memphis Grizzlies guard O.J. Mayo says he believes an “energy drink” he bought at a gas station contained the substance that led to his 10-game suspension for violating the NBA’s drug policy.

Mayo was jovial and smiling as he spoke about his suspension for the first time Saturday before the Grizzlies’ game against the Washington Wizards, taking questions from reporters on the team’s practice court.

But he wouldn’t get too specific.

“I didn’t know it had any bad substances in it, and it caused a 10-game suspension,” Mayo said. “It’s not like I went to a GNC and got some Muscle Armor or ordered some supplement off the Internet or anything. It was just a local gas station that kind of got me hemmed up.”

The NBA suspended Mayo on Thursday for testing positive for dehydroepiandrosterone (DHEA), which is on the league’s list of banned performance-enhancing drugs. His suspension started Friday night at Philadelphia, and he will be eligible to return Feb. 15, also against the 76ers in Memphis.

Mayo spoke and then had to leave the arena at least two hours before tipoff. The Grizzlies were holding O.J. Mayo bobblehead night in honor of the No. 3 pick overall in the 2008 draft.

— The Associated Press