The medal match pairings in all weight classes have been determined at the 2001 Women's University National Championships, held at Northwestern Univ. in Evanston, Ill., March 31.    Only two returning champions will have a chance to defend their title, Tina Wilson of the Sunkist Kids at 123.25 pounds and Iris Smith of the Sunkist Kids at 165.25 pounds.    Wilson, who was the Outstanding Wrestler of this event last year, will face 2001 World silver medalist Patricia Miranda of the Dave Schultz WC in the finals, clearly the most anticipated match of Sunday's finals.    Smith will battle Dominique Smalley of Missouri Valley in the finals. Smith was a member of the 2000 U.S. Women's Senior World Team.    At 101.25 pounds, it will be an all-Missouri Valley College finals, as Clarissa Chun will face teammate Sandra Padron .    At 112.25 pounds, Jenny Wong of the Sunkist Kids will battle Shelly Ann Tomita of Missouri Valley College.    The finals at 136.5 pounds will feature Erin Tomeo of the Sunkist Kids against Tonya Evinger of Missouri Valley College.    At 149.75 pounds, Toccara Montgomery of the Sunkist Kids will face Katie Downing of the Univ. of Minnesota-Morris.    All third-place and fifth-place matches will also be contested on Sunday.    WOMEN'S UNIVERSITY NATIONALS  at Evanston, Ill., March 31, 2001    101.25 pounds  1st - Clarissa Chun (Missouri Valley) vs. Sandra Padron (Missouri Valley)  3rd - Audrey Carasco (Missouri Valley) vs. Rachel Bernardes (Missouri Valley)  5th - Candice Takamatsu (Rainbow) vs. Barbara Crouse (Cumberland College)  Semifinals - Chun pin Bernardes, 1:41; Padron pin Carrasco, 3:21    112.25 pounds  1st - Jenny Wong (Sunkist Kids) vs. Shelly Ann Tomita (Missouri Valley)  3rd - Marianne Vollmer (Missouri Valley) vs. Miriam Jenkins (All-Marine)  5th - Angela Hesener (Missouri Valley) vs. Katie Kunimoto (Cumberland College)  Semifinals - Wong dec. Kunimoto, 9-2; Tomita dec. Hesener, score unavailable    123.25 pounds  1st - Tina Wilson (Sunkist Kids) vs. Patricia Miranda (Dave Schultz WC)  3rd - Cheryl New (Missouri Valley) vs. Grace Magnussen (Missouri Valley)  5th - Carrie Birge (Missouri Valley) vs. Aimee McNab (Missouri Valley)  Semifinals - Wilson dec. Birge, 10-3; Miranda dec. Magnussen, 5-0    136.5 pounds  1st - Erin Tomeo (Sunkist Kids) vs. Tonya Evinger (Missouri Valley)  3rd - Kate Zeitler (Cumberland College) vs. Tori Adams (Missouri Valley)  5th - Lauwa'e Smith (Missouri Valley) vs. Joy Warren (Cumberland College)  Semifinals - Tomeo dec. Smith, 8-0; Evinger dec. Adams, 10-1    149.75 pounds  1st - Toccara Montgomery (Sunkist Kids) vs. Katie Downing (UM-Morris)  3rd - Kaci Lyle (Missouri Valley) vs. Mollie Keith (Missouri Valley)  5th - Tina Arnds (Missouri Valley) vs. Megan Williams (Missouri Valley)  Semifinals - Montgomery pin Keith, 2:24; Downing dec. Lyle, 4-0    165.25 pounds  1st - Iris Smith (Sunkist Kids) vs. Dominique Smalley (Missouri Valley)  3rd - Anne Waddell (Cumberland College) vs. Samantha Branka (UM-Morris)  5th - Heidi Callentine (Cumberland College) won by inj. dft. over Melani Macari (Missouri Valley)  Semifinals - Smith pin Macari, 1:50; Smalley pin Callentine, 0:20