With help from its 9 p.m. (ET) medical drama “Grey’s Anatomy,” ABC edged past a competitive CBS Thursday to win the night among the broadcasters in the adults 18 to 49 ratings group.

“Grey’s” scored a 9.4 national rating in adults 18 to 49, a number that includes live viewing plus same-day viewing via digital video recorders, according to Nielsen Media Research.

In what has become one of the most competitive time periods on the network schedules, CBS’s 9 p.m. procedural “CSI” was second for the night in adults 18 to 49 with a 7.5 rating. While “Grey’s” was flat with its performance from last week, “CSI” was up 3 percent in adults 18 to 49.

At 8 p.m. CBS was the top broadcaster in adults 18 to 49 with “Survivor: Cook Islands” (5.5), followed by ABC’s “Ugly Betty” (4.3) and NBC’s “My Name is Earl” (3.9) and “The Office” (4.1) hour-long comedy block. On The CW, “Smallville” (2.1) edged out the 8:16 p.m. game one of Major League Baseball’s National League championship series (1.9). Fox scored a 2.6 in adults 18 to 49 for the game between the St. Louis Cardinals and the New York Mets.

At 10 p.m., NBC’s veteran “ER” (6.1) outperformed both of its broadcast competitor newcomers, CBS’s “Shark” (4.0) and ABC’s “Six Degrees” (3.6).

ABC was the top broadcaster in adults 18 to 49 with a 5.9, followed by CBS (5.7), NBC (4.4), Fox (2.5) and The CW (1.9).