Definitions for "Undercard"
The lower card matches that begin a show.
The undercard or preliminary matches refers to any bouts that occur before the headline or 'Main Event' of a particular boxing, wrestling, or other bout-style sporting match. Typically the undercard is intended to provide fans with an opportunity to see up-and-coming fighters or fighters who are lesser known and less popular than their counterparts in the main event. The undercard also ensures that if the main event ends quickly fans will still feel that they received sufficient value for the price of their admission.