CBS closed out seasonlong wins in daytime and latenight during the April 11- 15 Nielsen week, while ABC took the morning race and Fox Children’s Network rounded out fringe ratings with its Saturday-morning dominance.ABC also premiered a new daytime hour, “Mike & Maty,” attracting a bland 1.6 rating/7 share. That compares with a 1.8/8 for the series it replaced, “Home,” in its final weeks. The new Buena Vista Prods. series was cleared in 83% of the U.S. and was hurt by an interruption due to an April 14 speech by President Clinton. CBS finished the season with a 6.4/23 in daytime, followed by ABC (4.8/17) and NBC (3.1/11). Last week’s averages were CBS, 5.9/23; ABC, 4.4/17; NBC, 2.9/ 12. CBS and ABC tied last week among women 18-49, with a 3.5 rating each, to NBC’s 2.1. The CBS household winning streak is now 267 weeks. Repeats of “Late Show With David Letterman” (4.9/16) delivered the show’s lowest weekly average yet and edged “The Tonight Show With Jay Leno” (4.5/14) by the narrowest margin since the CBS series premiered. Both latenighter’s topped “Nightline” (5.1/14) in its half-hour. Letterman averaged a 5.8/18 during the 30-week season that began Sept. 20, compared to a 4.4/13 for Leno. Weekly tie “Good Morning America” and “Today” tied in the early-morning race with a 4.0 rating each, meaning the ABC show has had a share of first place (it also edged “Today” in share, 19 to 18) for 10 consecutive weeks. The shows were a push among adults 25-54 as well, but the NBC breakfastcast enjoyed a slight edge, 1.6 to 1.5, in adults 18-49. “CBS This Morning” (2.8/13) remains third, including a 0.9 rating among the key adult demo, and appears to have given up any gains from the Winter Olympics. Season averages are “GMA,” 4.5/19; “Today,” 4.3/18; “CBS This Morning,” 3.2/14. Fox Children’s Network finished the season with a 7 rating among kids, compared to a 4.6 each for ABC and CBS. Household averages are FCN, 3.6/13; CBS, 2.8/10; ABC, 2.6/10. Fox also kept its calendar-year ’94 string going Saturday, averaging a 7.1 among children 2-11, compared to a 4.4 and 4.2, respectively, for CBS and ABCduring the same four hours.