Basketball (6 p.m., ESPN): A game from the NBA's summer Rocky Mountain Revue in Salt Lake City.
Big Brother (7 p.m., Ch. 2): Two of the housemates are nominated for expulsion.
Friends (7 p.m., Ch. 5): Rachel's devious little sister (guest star Reese Witherspoon) is in town, and she's dating Ross. (Repeat)
Popular (7 p.m., Ch. 30): Sam and her gang bleach their hair to prove that popularity is based on blondness; Brooke and her gang go dark to prove them wrong. (Repeat)
Who Wants to be a Millionaire? (8 p.m., Ch. 4): Regis Philbin is the host.
Just Shoot Me (8:30 p.m., Ch. 5): A young black man claims that he's Jack's son. (Repeat)
48 Hours (9 p.m., Ch. 2): A report on attempts to predict tornadoes.
ER (9 p.m., Ch. 5): Weaver incurs Romano's wrath as she disobeys his orders regarding a patient. (Repeat)
'N Sync: Live from Madison Square Garden (10 p.m., HBO): The hugely popular group performs in New York, the latest stop on the tour that brought them to Salt Lake City last month.