The Krystal Square Off was the official World Hamburger Eating Championship from 2004 to 2009, taking place in Chattanooga, Tennessee and sanctioned by the International Federation of Competitive Eating (IFOCE).
The Krystal Square Off consisted of a qualifying tour and a world championship.
In 2004, the first year of the event, local amateurs Sam Vise and Jeff Hicks defeated professionals to earn a position at the world championship.
The two-minute qualifier record stands at 39 Krystals eaten by "Humble" Bob Shoudt in Nashville, 2007.
Citing "significant" demands on company resources, the company cancelled the event in 2010, looking to shift its "marketing focus and efforts" to new products and new store locations.