TONIGHT'S MUST-SEE

"The Closer" season opener, 6 p.m., TNT. Even by the high "Closer" standards, this is a great hour. As usual, we have a stark case. A family was slain; the son, in a drug haze, survived. Enter Brenda, wonderfully played by Kyra Sedgwick. She's deeply moved by the tragedy, but a calm pro in the interrogation room. There are the usual complications, as Brenda struggles with budget and romance problems. And there are some clever surprises in the mystery.

"Age of Love" debut, 8 p.m., NBC. Mark Philippoussis is a tennis star, 6-feet-5, handsome and polite. He's also 30 and is surprised that the gorgeous women first introduced in this dating show range from 39 to 48. The result tends to one-note, with the women portrayed as loud and shallow. Then some 20-somethings are thrown in. Overstatement abounds. One older woman is shown crocheting; the younger ones are in bikinis, with a hula hoop. Fortunately, Philippoussis towers above the cliches.

OF NOTE

"The Closer," 4 p.m., TNT. To get us in the mood for the season-opener, here's a two-parter from last season. Brenda must quietly investigate the murder of a defector.

"Heartland" debut, 7 p.m., TNT. Treat Williams plays a transplant surgeon who is great at his work and bad at life. He ignored his wife; now he ignores his girlfriend and his daughter. This show lacks the depth of "The Closer," but has its moments. Williams is excellent; so is Kari Matchett, as the ex-wife who deals with the families of organ donors.

"The New Adventures of Old Christine," 7:30 p.m., CBS. In an exceptionally funny rerun, Christine tries to stay sober and sensible at a wedding.

"Kyle XY," 8 p.m., ABC Family. Last week, the lab blew up and a second artificial creation — a teen-looking girl — wandered away. Kyle is back home, unaware of the complications coming.

"Simon Schama's Power of Art," 9 and 10 p.m., PBS. This launches a seven-week, eight-hour series. Each hour, Schama (a writer and scholar) will discuss the troubled life of an artist and the masterwork that made a difference. That starts with Vincent van Gogh at 9 p.m. and Pablo Picasso at 10.

"Dateline," 9 p.m., NBC. Matt Lauer interviews Prince William and Prince Harry.