The first game of the NBA Finals dominated primetime TV viewing on Thursday, with the ABC telecast attracting an average of 10.47 million viewers between 9 00 p.m. and 11 00 p.m., peaking in the second half hour with 11.03 million viewers. The figures, however, were well below the comparable night a year ago when the network drew 13.38 million viewers for the first night of the NBA finals -- 22 percent greater than this year's figures. The results gave NBC a rare win for a Thursday -- a night that it once controlled completely with what it called Must-See-TV night.