This guide is designed to alert readers to the scope and variety of programming coming up. Listing is not meant to represent blanket endorsement. Viewers are urged to be selective. FRIDAY Once in a Lifetime (PBS, 9-11 p.m.): ``Great Performances'' production of the Hollywood-baiting 1930 Broadway farce by Moss Hart and George S. Kaufman (see preview at right).

SATURDAY Ballet: Romeo and Juliet (PBS, 8-11 p.m.): ``Great Performances'' offers a ``Live From Lincoln Center'' presentation of American Ballet Theatre's full-length version of the Shakespeare tragedy, with choreography by Kenneth MacMillan to Prokofiev's score. NBA Playoffs (CBS, 3:30-6 p.m.): Live coverage of a first-round Game 5 or Conference Senifinal Game 1 (check local listings), as the elimination process begins for pro basketball's final championship games in June. Tennis (ABC, 2-4:30 p.m.): Jimmy Connors, John McEnroe, other top players compete in the Eagle Tournament of Champions, covered live from the famous West Side Tennis Club in Forest Hills, N.Y.

SUNDAY The Caine Mutiny Court Martial (CBS, 9-11 p.m.): New production of Herman Wouk's Broadway play - based on the material in his Pulitzer Prize-winning 1951 novel, ``The Caine Mutiny,'' which also became a movie. The Drug Clans of Lebanon (TBS/cable, premi`eres 9-9:30 p.m.): First segment of the ``National Geographic Explorer'' series exploring the background of drug-trafficking in that Middle Eastern country. NBA Playoffs - (CBS, 1-6 p.m.): Check local listings for details on a pro-basketball doubleheader. Tennis (ABC, 2-5 p.m.): Continuation of the Eagle Tournament of Champions (see Saturday listing).

MONDAY This Honorable Court (PBS, 9-10 p.m.): In this second program of a two-parter on the US Supreme Court, justices describe their oral argument and secret conference process.

TUESDAY Frontline (PBS, 9-10 p.m.): ``Racism'' looks at the growing number of racial incidents at American universities. Troupers (PBS, 10-11 p.m.): The event-filled 25-year history of the San Francisco Mime Troupe is seen through lots of performance footage.

WEDNESDAY Rocky IV (CBS, 9-11 p.m.): Sylvester Stallone fans can see him in the first network airing of this third sequel of the movie series - with Carl Weathers, Talia Shire, and Burt Young. The Trial of Bernard Goetz (CBS, 9-11:30 p.m.): ``American Playhouse'' drama based on the trial transcripts in the much-covered case of the New York subway vigilante.

Schedules may vary in some time zones. Please check listings, especially for PBS, where local stations often air programs on differing days and times.

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