Kelly Slater clinched his record-extending 11th world surfing title four days after he was prematurely crowned champion because of a calculation error by the Association of Surfing Professionals.

Slater, 39, ensured that he’ll finish atop the 2011 ASP world rankings by advancing to the quarterfinals of the Rip Curl Pro Search in San Francisco today, the ASP said. Officials had awarded Slater the title Wednesday because of an error in the rankings system.

"We’re sure now," Slater said on the ASP website. "I was upset about it, but I also thought it was really funny. There are no hard feelings towards ASP and mistakes happen."