SPORTS ON WEEKEND TV : Football Playoffs

Round Two of the National Football League playoffs will be the focus of most sports fans on a weekend that will include college and pro basketball, hockey and taped coverage of the return of disgraced Canadian sprinter Ben Johnson.

The three NFL teams (the Buffalo Bills, the San Francisco 49ers and the Raiders) considered by experts to have the best chance of winning Super Bowl XXV at Tampa, Fla., in two weeks, make debuts in the conference divisional playoffs. The Bills, who finished the regular season with the AFC’s best record (13-3), play host to the Miami Dolphins at 9:30 a.m. today on Channels 4, 36 and 39. The 49ers, seeking to become the first team to win three consecutive NFL titles since the 1965-67 Packers, will face the Washington Redskins at 1 p.m. today on Channels 2 and 8.

Sunday’s divisional play begins at 9:30 a.m. on Channels 2 and 8 when the Chicago Bears meet the New York Giants. At 1 p.m., the Raiders, appearing in their first playoff game since 1985, take on the Cincinnati Bengals at the Coliseum. KNSD Channel 39 in San Diego and KMIR Channel 36 will carry the game.

College and pro basketball: No. 7 UCLA will attempt to break No. 6 Arizona’s 55-game home-court win streak (best in the nation) at 4 p.m. today on Channels 2 and 63. No. 1 Nevada Las Vegas takes on Big West opponent Fresno State in an 8 p.m. SportsChannel telecast tonight. On Sunday, USC will face Arizona State (4 p.m., Channels 2 and 63), and the Lakers will play the Houston Rockets (7:30 p.m., Prime Ticket.)