TONIGHT'S MUST-SEE

"Basketball," 10:30 a.m., CBS. Now the NCAA tournament is getting serious. This doubleheader will decide half of the teams in next weekend's final four; the other half will be decided tomorrow.

"Special Investigations Unit: Grady's Anatomy," 2 p.m., CNN; repeats at 5 and 8 p.m., plus same times tomorrow, unless pre-empted by breaking news. "Grey's Anatomy," the ABC medical show, might seem like pure fiction, with its telegenic doctors who have quirky lives. Still, this documentary finds similar people in Atlanta at Grady Memorial Hospital. That's where Dr. Sanjay Gupta (CNN's medical correspondent) works. Dr. Andrea Meinerz is a super-cute redhead who spends her spare time playing poker. Dr. Nii-Daako Darko, the son of immigrants from Ghana, grew up in a tough Newark neighborhood. Dr. Robin Lowman is a doctor's daughter who sang off-Broadway. Dr. Luis Tumialan is a tough former Navy diver who does delicate brain surgery. All have been thrown into a world of 30-hour shifts, occasional triumphs and frequent tragedies.

OF NOTE

Basketball, morning and afternoon, ESPN and ESPN2. The NCAA women's tournament is down to its sweet 16. That includes a primetime game at 3 p.m. on ESPN.

"Celebrity Debut," 7 p.m., ABC. This rerun assembles clips of now-famous people in their early days. That includes Halle Berry, Kate Winslet and John Travolta.

"Coyote Ugly" (2000), 8 p.m., ABC. An optimistic young woman (Piper Perabo) heads to New York, dreaming of music fame. Instead, she ends up at a bar, where hot-looking waitresses and bartenders take turns singing.

"Law & Order," 8 p.m., NBC. When a lawyer is killed, the investigation looks into wire-tapping and escort services.

"Law & Order: Criminal Intent," 9 p.m., NBC. A murder puts a spotlight on the fierce rage between two families, one Italian and the other Pakistani.

"Saturday Night Live," 10:30 p.m., NBC. Peyton Manning, the star quarterback, hosts, with music by Carrie Underwood.