With the start of the boy's Junior Freestyle National Championships event on Thursday, July 25, USA Wrestling's combined 2002 ASICS-Vaughan Junior and Cadet National Championships became the largest wrestling tournament in world history. The tournament is being hosted at the FargoDome on the campus of North Dakota State Univ. in Fargo, N.D.    Through Thursday, there were a total of 4,387 entries in the event, a tremendous increase over other years. Previously, the largest wrestling tournament in history was the 1997 Junior and Cadet National Championships, which had 3,641 athletes in the competition.     The tournament this week is already 746 entries higher than the 1997 record. However, the final record is not complete, as the number of participants will grow on  Friday, when the first ASICS-Vaughan Junior Nationals for girls begins its competition.    High school wrestlers in grades 9-12 are eligible to compete on the Junior level. Wrestlers who are 15 and 16 years old are eligible to compete on the Cadet level.    Both the Junior National Championships and the Cadet National Championships for boys set new records for participants, and as a combined tournament, the events shattered the previous mark.    The Cadet Nationals set an overall  record of 2,219 participants, topping the previous mark of 1,820 at the 1995 Cadet Nationals.    Included this year were 1,208 Cadet freestyle wrestlers and 1,011 Cadet Greco-Roman wrestlers, both records in their specific style.    The Junior Nationals set an overall record of 2,168 participants, blasting the previous record of 1,838 athletes set in the 1997 Junior Nationals.    Included this year were 1,254 Junior freestyle athletes and 914 Junior Greco-Roman athletes, both records in their specific style.    Each style also set a new record. The Junior and Cadet National  freestyle competition included 2,462 athletes, the largest freestyle wrestling event ever held. The Junior and Cadet National Greco-Roman competition featured 1,925 athletes, the largest Greco-Roman wrestling event ever held.    One of the reasons the records were set was the addition of weight classes in both the Junior and Cadet divisions. In order to align with existing high school wrestling weight classes, USA Wrestling added four Cadet weight classes and three Junior weight classes to the competition.    "I'm excited about the increase in participation," said Pete Isais, USA Wrestling's Director of National Events. "Along with the tremendous growth has been a challenge in accommodating such as large increase. What impresses me the most is how our volunteers have stepped up to the plate to manage the last minute details. Since we aligned with the high school weights, our numbers have increased. This provides even more opportunities for young athletes to be involved with USA Wrestling."