(Photo credit: Mike Watters) Charlotte Hornets sharpshooter Kon Knueppel sustained a left hamstring injury during an offseason on-court activity and could miss the start of the regular season. The Hornets said Friday that Knueppel and forward Grant Williams (right hamstring) will miss the preseason before being re-evaluated during the first week of the regular season. The Hornets open the campaign on Oct. 2