Here's the URL for the complete story in the Washington Post.
http://www.azcentral.com/news/articles/1018wheel18.html
If the facts in the case are correct, this fellow seems to have a solid course of action. A court could interpret Sajak's exaggerated action toward the contestant as a battery, if this were a criminal suit.
Remember that a simple battery is the touching or use of force on a person without the person's specific consent; not an assault, which by definition is an act that puts a person in immediate danger or in fear of harm or contact.