•Olympic trials: NBC has plenty of diving and gymnastics coverage this weekend as the U.S. team is selected. On Saturday, KFOR-4 will air the 3-meter springboard finals at 2:30 p.m., men's gymnastics finals at 3:30 p.m. and women's gymnastics preliminary round at 7 p.m. (taped). Coverage continues Sunday with the men's and women's platform diving at 2 p.m. and women's gymnastics finals at 6 p.m. MSNBC will air taped coverage of the wrestling trials at 11 a.m. Sunday. •Baseball: There are some intriguing interleague matchups. Chicago rivals, the Cubs and White Sox, who both are in first place, square off at Wrigley Field, 1 p.m. today, noon Saturday, WGN; 7 p.m. Sunday, ESPN. St. Louis travels to Fenway Park to face Boston, 6 tonight, Cox 2; 2:30 p.m. Saturday, KOKH-25; 12:30 p.m. Sunday, Cox 7; the Texas Rangers, formerly the Washington Senators, play at the Washington Nationals, 6:30 tonight, 12:30 p.m., Sunday, FSNSW. The College World Series continues, including Georgia vs. Stanford at 1 p.m. today. The championship series begins Monday night. •Auto racing: TNT airs the Toyota/Save Mart 350 from Sonoma, Calif., at 4 p.m. Sunday.