Among the fledgling networks, the WB had a 3.5 rating and 5 share last week. UPN had a 2.0 rating and 3 share and Pax TV was at 0.6 and 1. NBC's ''Nightly News'' won the evening news competition with an 8.2 rating and 16 share. Also in the news arena, CNBC's weekend ''Tim Russert Show'' scored the highest ratings in the program's five-year history Saturday with Rush Limbaugh as guest. A rating point represents 994,000 households, or 1 percent of the nation's estimated 99.4 million TV homes.
Share is the percentage of in-use televisions tuned to a given show.