Hoops-fueled CBS handily won the ratings race last week, topping second-place ABC by more than 3 million viewers. Saturday's Final Four contests averaged 16.6 million viewers, the best performance since 1998. CBS also claimed the top show of the week with CSI. Fox, meanwhile, took top honors among adults 18-49 thanks to American Idol and the best-ever numbers for its new medical phenom House.