Davis Cup, First Round, U.S. vs. Croatia ESPN2 4 p.m. | After a five-year hiatus Andre Agassi is back with the Yanks. Cavaliers at 76ers 7 p.m. | Super soph LeBron James takes on the league's newest dynamic duo: Chris Webber and Allen Iverson.
Iditarod | The 1,150-mile race begins in downtown Anchorage. Among the 79 mushers: Rachael Scdoris, 19 and legally blind. SI FOR KIDS: Next Snow Search NBC 2 p.m. | The quest to find America's top junior skiers and snowboarders ends in Keystone, Colo.
Cycling, Paris-Nice OLN 5 p.m. | Lance Armstrong makes his debut with his new Discovery Channel team. L.A. Marathon 10:30 a.m. | A live webcast of more than 25,000 runners clogging the downtown streets is available at NBC4.tv.