• Men's tennis plays UCLA at 1:30 p.m. in Robson Tennis Center. Men's tennis plays University of Southern California tomorrow at noon in Robson Tennis Center.

• UA gymnastics plays the Arizona Invitational at 7:30 p.m. in McKale Center.

• UA softball plays the Hillenbrand Invitational at Lincoln Park, located at Pantano Road and Escalante Road, at 1 p.m. The Invitational continues at Lincoln Park tomorrow at 3 p.m. On Sunday, the Invitational concludes at Hillenbrand Stadium. Call 62 1-4163 for game schedule.

• The UA College of Law sponsors "Recent Changes in Mexico's Judiciary Law," a faculty presentation by Olga Sanchez Cordero, Justice of the Mexican Supreme Court, at 3:30 p.m. in Courtroom 106 of the College of Law.

• The UA College of Medicine's Arizona Prevention Center presents "Nutrition and Cancer: Recent Advances in Prevention and Treatment," a seminar for health care professionals, Saturday from 9 a.m. to 3 p.m. in the UA College of Medicine Room 8403. Cal l 626-7863 for fee information.

• The Professional Opportunities Development project of GPSC and ASUA sponsor author Ellen Dissanayake discussing "The Evolutionary Origin and Significance of Music" at 2 p.m. in Psychology Room 306.