LAS VEGAS, July 16 Marcus Williams had 23 points and 10 rebounds and Al Thornton scored 20 points Wednesday as the Los Angeles Clippers spoiled the 2008 Las Vegas Summer League finale of rookie sensation O.J. Mayo with an 82-74 victory over the Memphis Grizzlies.

Mayo, acquired by the Grizzlies in a draft day trade with Minnesota, scored 20 points. In his first games as a professional, he had a 26-point outing, made a 70-foot shot and had a thunderous transition dunk while looking consistently sharp.

The Clippers shot 9-of-12 from the field in the first quarter, opening a 22-18 lead as Williams scored nine points. The Grizzlies shot just 6-of-19 as Mayo was scoreless.

Memphis went scoreless in the second quarter until David Simon connected on a pair of free throws at the 6:38 mark.

The Grizzlies made a move in the fourth quarter, when Mayo scored nine points. They forged a 70-70 tie before the Clippers went on a 12-4 run over the final four minutes.

Memphis went 2-3 in summer play. Los Angeles returns to the hardwood Thursday vs. New Orleans.